Add link in query docs to code showing all available query functions

[mieubrisse]

The examples don't show many of the functions available. Added a link in the docs to the code where the functions are defined.

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Important

Add link in querying-data.rst to source code for available query functions.

• Documentation:
  • Adds a link in querying-data.rst to the source code for all available query functions for complex queries.

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[ellipsis-dev]

Important

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1. src/examples/querying-data.rst:18

• Draft comment:
  Consider formatting the added URL using reStructuredText hyperlink syntax (e.g. query functions <https://github.com/ActivityWatch/aw-server-rust/blob/master/aw-query/src/functions.rs>_) for consistency in the docs. Also, using a permalink to a specific commit or stable branch could help avoid potential link rot.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

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