Fix the docs in the quick docs on the label

[yhaliaw]

Applicable spec:

Overview

Update the docs to prevent confusion on the labels set for the runners.

Rationale

Feedback on from the users.

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, complex)

[erinecon]

I approve of the documentation changes 👍

[github-actions]

Test coverage for fa25490

Name                         Stmts   Miss Branch BrPart  Cover   Missing
------------------------------------------------------------------------
src/charm.py                   597    150    151     26    72%   237-239, 305-324, 342-344, 345->349, 375-379, 452, 459-461, 488-493, 510-516, 537, 549-555, 570-571, 590-591, 600, 605, 635-636, 638->647, 642->647, 652-658, 692, 696-701, 752-757, 766->769, 792-804, 808-809, 837-864, 877-882, 901-911, 926-928, 975-976, 978-979, 981-982, 1061->1063, 1128-1129, 1167-1169, 1177-1183, 1261-1314, 1318
src/charm_state.py             452     17     96      5    95%   271-283, 508-512, 634-635, 690-691, 1126->1129, 1133-1134, 1181
src/errors.py                   25      0      0      0   100%
src/event_timer.py              52      6      0      0    88%   105-106, 143-144, 160-161
src/firewall.py                 51     18     20      0    61%   42-43, 66-69, 111-185
src/github_client.py            23      2      6      1    90%   66->exit, 71-72
src/logrotate.py                43      0      2      0   100%
src/lxd_type.py                 35      0      2      0   100%
src/runner_manager_type.py      51      0      8      0   100%
src/runner_type.py              38      0     10      0   100%
src/shared_fs.py                93     17     10      1    83%   52-53, 120-121, 146-147, 155-156, 162-163, 181, 184-185, 197-198, 241-242
src/utilities.py                32      4      6      2    79%   66-69, 111
------------------------------------------------------------------------
TOTAL                         1492    214    311     35    83%

Static code analysis report

Run started:2024-09-20 04:57:30.146406

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 4968
  Total lines skipped (#nosec): 2
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 6

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):