mm/doc: fix page_maybe_dma_pinned kerneldoc

make htmldocs reports:

  include/linux/mm.h:1341: warning: Excess function parameter 'Return' description in 'page_maybe_dma_pinned'

Fix a few other formatting nits while I'm editing this description.

Link: https://lkml.kernel.org/r/20210322195022.2143603-2-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/mm.h

@@ -1271,10 +1271,11 @@ void unpin_user_page_range_dirty_lock(struct page *page, unsigned long npages,
 void unpin_user_pages(struct page **pages, unsigned long npages);
 
 /**
- * page_maybe_dma_pinned() - report if a page is pinned for DMA.
+ * page_maybe_dma_pinned - Report if a page is pinned for DMA.
+ * @page: The page.
  *
  * This function checks if a page has been pinned via a call to
- * pin_user_pages*().
+ * a function in the pin_user_pages() family.
  *
  * For non-huge pages, the return value is partially fuzzy: false is not fuzzy,
  * because it means "definitely not pinned for DMA", but true means "probably
@@ -1292,8 +1293,7 @@ void unpin_user_pages(struct page **pages, unsigned long npages);
  *
  * For more information, please see Documentation/core-api/pin_user_pages.rst.
  *
- * @page:	pointer to page to be queried.
- * @Return:	True, if it is likely that the page has been "dma-pinned".
+ * Return: True, if it is likely that the page has been "dma-pinned".
  * False, if the page is definitely not dma-pinned.
  */
 static inline bool page_maybe_dma_pinned(struct page *page)