DOC: Added deprecation to convert_objects docstring#12052
DOC: Added deprecation to convert_objects docstring#12052

Added deprecation warning to convert_objects docstring   Closes #12052

Author: MattRijk <matthewrijk@gmail.com>

Closes #12209 from MattRijk/doc-12052 and squashes the following commits:

5be5d7a [MattRijk] Changed See also to correct format
8ff0da0 [MattRijk] Added See also section to convert_objects docs.
a10997d [MattRijk] DOC: Added deprecation to convert_objects docstring#12052

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