gpl-1.0-plus false positives

[xu1119]

When trying to scan this file with latest scancode, It get the following license :
File from https://github.com/chapel-lang/chapel/blob/master/CHANGES.md

{
          "key": "gpl-1.0-plus",
          "score": 100.0,
          "name": "GNU General Public License 1.0 or later",
          "short_name": "GPL 1.0 or later",
          "category": "Copyleft",
          "is_exception": false,
          "owner": "Free Software Foundation (FSF)",
          "homepage_url": "http://www.gnu.org/licenses/old-licenses/gpl-1.0-standalone.html",
          "text_url": "http://www.gnu.org/licenses/old-licenses/gpl-1.0-standalone.html",
          "reference_url": "https://enterprise.dejacode.com/urn/urn:dje:license:gpl-1.0-plus",
          "spdx_license_key": "GPL-1.0-or-later",
          "spdx_url": "https://spdx.org/licenses/GPL-1.0-or-later",
          "start_line": 8818,
          "end_line": 8820,
          "matched_rule": {
            "identifier": "gpl_234.RULE",
            "license_expression": "gpl-1.0-plus",
            "licenses": [
              "gpl-1.0-plus"
            ],
            "is_license_text": false,
            "is_license_notice": true,
            "is_license_reference": false,
            "is_license_tag": false,
            "matcher": "2-aho",
            "rule_length": 3,
            "matched_length": 3,
            "match_coverage": 100.0,
            "rule_relevance": 100.0
          },
          "matched_text": "- target audience: general public\n\nLicense Changes"
        },

The context of matched_text is：

High-Level Themes
-----------------
- multi-locale task parallelism
- improved task parallel correctness, features, thread management
- improved stability of core features
- very initial/limited support for data parallelism, distributed arrays
- target audience: general public

License Changes
---------------
- switched from MIT to BSD license (see LICENSE)
- updated user agreement text (see AGREEMENT)

Description

gpl-1.0-plus false positives

How To Reproduce

scancode -li --license-text --json-pp - CHANGES.md.txt

System configuration

• What OS are you running on? (Windows/MacOS/Linux)
  Ubuntu18.04
• What version of scancode-toolkit was used to generate the scan file?
  ScanCode 3.2.3
• What installation method was used to install/run scancode? (pip/source download/other)
  pip
• Python version
  Python 3.6.12

[AyanSinhaMahapatra]

"general public" and "license" are there in consecutive lines accidentally. @pombredanne this also doesn't get picked up by the analyzer currently, but the extra heuristics you suggested at aboutcode-org/scancode-analyzer#29 (i.e. less word rule and line numbers are > 1000) would pick this up.

[pombredanne]

I think a false positive rule with "audience general public License Changes" may be enough for this