install from source: clean up comments

Update comments in the install from source script so that:

1. Sentences begin with capital letters.
2. Sentences end with punctuation.
3. Comments are within 80 characters per line.

src/linux/Packaging.Linux/install-from-source.sh

@@ -1,23 +1,23 @@
 #!/bin/sh
 
-# halt execution immediately on failure
-# note there are some scenarios in which this will not exit;
-# see https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html
-# for additional details
+# Halt execution immediately on failure.
+# Note there are some scenarios in which this will not exit; see
+# https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html
+# for additional details.
 set -e
 
 is_ci=
 for i in "$@"; do
     case "$i" in
         -y)
         is_ci=true
-        shift # past argument=value
+        shift # Past argument=value
         ;;
     esac
 done
 
-# in non-ci scenarios, advertise what we will be doing and
-# give user the option to exit
+# In non-ci scenarios, advertise what we will be doing and
+# give user the option to exit.
 if [ -z $is_ci ]; then
     echo "This script will download, compile, and install Git Credential Manager to:
 
@@ -47,7 +47,7 @@ install_shared_packages() {
 
     local shared_packages="git curl"
     for package in $shared_packages; do
-        # ensure we don't stomp on existing installations
+        # Ensure we don't stomp on existing installations.
         if [ ! -z $(which $package) ]; then
             continue
         fi
@@ -66,19 +66,19 @@ ensure_dotnet_installed() {
         chmod +x ./dotnet-install.sh
         bash -c "./dotnet-install.sh"
 
-        # since we have to run the dotnet install script with bash, dotnet isn't added
-        # to the process PATH, so we manually add it here
+        # Since we have to run the dotnet install script with bash, dotnet isn't
+        # added to the process PATH, so we manually add it here.
         cd ~
         export DOTNET_ROOT=$(pwd)/.dotnet
         add_to_PATH $DOTNET_ROOT
     fi
 }
 
 verify_existing_dotnet_installation() {
-    # get initial pieces of installed sdk version(s)
+    # Get initial pieces of installed sdk version(s).
     sdks=$(dotnet --list-sdks | cut -c 1-3)
 
-    # if we have a supported version installed, return
+    # If we have a supported version installed, return.
     supported_dotnet_versions="6.0"
     for v in $supported_dotnet_versions; do
         if [ $(echo $sdks | grep "$v") ]; then
@@ -90,7 +90,7 @@ verify_existing_dotnet_installation() {
 add_to_PATH () {
   for directory; do
     if [ ! -d "$directory" ]; then
-        continue; # skip nonexistent directory
+        continue; # Skip nonexistent directory.
     fi
     case ":$PATH:" in
         *":$directory:"*)
@@ -110,8 +110,8 @@ apt_install() {
 
 sudo_cmd=
 
-# if the user isn't root, we need to use `sudo` for certain commands
-# (e.g. installing packages)
+# If the user isn't root, we need to use `sudo` for certain commands
+# (e.g. installing packages).
 if [ -z "$sudo_cmd" ]; then
     if [ `id -u` != 0 ]; then
         sudo_cmd=sudo
@@ -135,18 +135,18 @@ case "$distribution" in
         fi
 
         if $useMicrosoftFeed; then
-            # add dotnet package repository/signing key
+            # Add dotnet package repository/signing key.
             $sudo_cmd apt update && $sudo_cmd apt install wget -y
             curl -LO https://packages.microsoft.com/config/"$distribution"/"$version"/packages-microsoft-prod.deb
             $sudo_cmd dpkg -i packages-microsoft-prod.deb
             rm packages-microsoft-prod.deb
 
-            # proactively install tzdata to prevent prompts
+            # Proactively install tzdata to prevent prompts.
             export DEBIAN_FRONTEND=noninteractive
             $sudo_cmd apt install -y --no-install-recommends tzdata
         fi
 
-        # install dotnet packages and dependencies if needed
+        # Install dotnet packages and dependencies if needed.
         if [ -z "$(verify_existing_dotnet_installation)" ]; then
             $sudo_cmd apt update
             # First try to install via native feeds (Ubuntu 22.04 and later).
@@ -174,15 +174,15 @@ case "$distribution" in
         $sudo_cmd apt update
         install_shared_packages apt install
 
-        # install dotnet packages and dependencies
+        # Install dotnet packages and dependencies.
         $sudo_cmd apt install libc6 libgcc1 libgssapi-krb5-2 libssl1.1 libstdc++6 zlib1g libicu66 -y
         ensure_dotnet_installed
     ;;
     fedora | centos | rhel)
         $sudo_cmd dnf update -y
         install_shared_packages dnf install
 
-        # install dotnet/gcm dependencies
+        # Install dotnet/GCM dependencies.
         $sudo_cmd dnf install krb5-libs libicu openssl-libs zlib findutils which bash -y
 
         ensure_dotnet_installed
@@ -191,7 +191,7 @@ case "$distribution" in
         $sudo_cmd apk update
         install_shared_packages apk add
 
-        # install dotnet/gcm dependencies
+        # Install dotnet/GCM dependencies.
         $sudo_cmd apk add icu-libs krb5-libs libgcc libintl libssl1.1 libstdc++ zlib which bash coreutils gcompat
 
         ensure_dotnet_installed
@@ -202,7 +202,7 @@ case "$distribution" in
     ;;
 esac
 
-# detect if the script is part of a full source checkout or standalone instead
+# Detect if the script is part of a full source checkout or standalone instead.
 script_path="$(cd "$(dirname "$0")" && pwd)"
 toplevel_path="${script_path%/src/linux/Packaging.Linux}"
 if [ "z$script_path" = "z$toplevel_path" ] || [ ! -f "$toplevel_path/Git-Credential-Manager.sln" ]; then