📝 Add docstrings to feature/when-any

[coderabbitai]

Docstrings generation was requested by @mvandeberg.

• Feature: when_any #101 (comment)

The following files were modified:

• include/boost/capy/when_all.hpp
• include/boost/capy/when_any.hpp
• test/unit/when_any.cpp

These file types are not supported

• doc/modules/ROOT/nav.adoc
• doc/modules/ROOT/pages/coroutines/when-all.adoc
• doc/modules/ROOT/pages/coroutines/when-any.adoc

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[mvandeberg]

@coderabbitai Please close

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