docs: improve github status plugin documentation

Dependencies

• [2] C3XQSZZL add basic documentation for all plugins

Change contents

• replacement in doc/manual/src/plugins/README.md at line 114
  [2.1938]→[2.1938:1959](∅→∅)
  − Defaults to `*:*:*`.
  [2.1938]

  [2.1959]
  + This field is required and has no default value.
• replacement in doc/manual/src/plugins/README.md at line 143
  [2.2707]→[2.2707:2716](∅→∅)
  − details.
  [2.2707]

  [2.2716]
  + details. This field is only used if `github_authorization.<repo-owner>` is not set.
• edit in doc/manual/src/plugins/README.md at line 145
  [2.2717]

  [2.2717]
  +
• edit in doc/manual/src/plugins/README.md at line 151
  [2.2775]

  [2.2775]
  + ## This example will match all jobs

  + #jobs = .*
• replacement in doc/manual/src/plugins/README.md at line 154
  [2.2790]→[2.2790:2843](∅→∅)
  − authorization = Basic notgivingyoumypasswordosorry
  [2.2790]

  [2.2843]
  + authorization = Bearer gha-secret😱secret😱secret😱