pinmap_pinout : missing documentation of behavior (sets pin to PullNone)

It is easy to miss the fact that the pinmap_pinout() function also sets the pin to PullNone. This is fine as long as the hal implementation sets the pin to PullUp or PullDown if needed after calling pinmap_pinout and not before. Should be documented in comments and api documentation if possible.

Search the repository for the pinmap_pinout() definition, its comments, and the API documentation entry. Document that it sets the pin to PullNone and clarify that the HAL should apply PullUp or PullDown afterward when needed; verify the documentation build if one is available.

Written by the indexing model from the issue text.