page_pool: fix documentation typos

Correct grammar for better readability.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jesper Dangaard Brouer <hawk@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Link: https://lore.kernel.org/r/20231001003846.29541-1-rdunlap@infradead.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/page_pool/helpers.h

@@ -16,13 +16,13 @@
  * page_pool_alloc_pages() call.  Drivers should use
  * page_pool_dev_alloc_pages() replacing dev_alloc_pages().
  *
- * API keeps track of in-flight pages, in order to let API user know
+ * The API keeps track of in-flight pages, in order to let API users know
  * when it is safe to free a page_pool object.  Thus, API users
  * must call page_pool_put_page() to free the page, or attach
- * the page to a page_pool-aware objects like skbs marked with
+ * the page to a page_pool-aware object like skbs marked with
  * skb_mark_for_recycle().
  *
- * API user must call page_pool_put_page() once on a page, as it
+ * API users must call page_pool_put_page() once on a page, as it
  * will either recycle the page, or in case of refcnt > 1, it will
  * release the DMA mapping and in-flight state accounting.
  */