Add tip for absolute Exec path in documentation

[dleiferives]

Added a tip about replacing the Exec path with an absolute one in the running-on-gnome documentation.

Sometime in the last 2 years seems like absolute path is required.

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Important

Adds a documentation tip in running-on-gnome.rst for using absolute paths in Exec entries for GNOME desktop files.

• Documentation:
  • Adds a tip in running-on-gnome.rst to replace Exec relative paths with absolute paths in GNOME desktop files.
  • Example provided for changing Exec="~/.local/opt/activitywatch/kill.sh" to Exec="/home/<your-username>/.local/opt/activitywatch/kill.sh".
  • Clarifies the need to replace <your-username> with the actual username.

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[ellipsis-dev]

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1. src/running-on-gnome.rst:66

• Draft comment:
  The example shows Exec using '~'. For clarity, explicitly note that desktop environments do not perform tilde expansion, so replacing it with an absolute path (e.g. '/home//...') is necessary.
• Reason this comment was not posted:
  Comment did not seem useful. Confidence is useful = 0% <= threshold 50% The comment is purely informative, explaining a behavior related to tilde expansion in desktop environments. It does not provide a suggestion, ask for confirmation, or point out a potential issue in the code. Therefore, it violates the rule against making purely informative comments.

Workflow ID: wflow_SsMXnJ23PktMWm0j

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