rhashtable: Improve grammar

Change "a" to "an" according to the usual rules, fix an "if" that
was mistyped as "in", improve grammar in "considerable slow" ->
"considerably slower".

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20240329-misc-rhashtable-v1-1-5862383ff798@gmx.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/linux/rhashtable.h

@@ -633,7 +633,7 @@ static inline struct rhash_head *__rhashtable_lookup(
  * @params:	hash table parameters
  *
  * Computes the hash value for the key and traverses the bucket chain looking
- * for a entry with an identical key. The first matching entry is returned.
+ * for an entry with an identical key. The first matching entry is returned.
  *
  * This must only be called under the RCU read lock.
  *
@@ -655,7 +655,7 @@ static inline void *rhashtable_lookup(
  * @params:	hash table parameters
  *
  * Computes the hash value for the key and traverses the bucket chain looking
- * for a entry with an identical key. The first matching entry is returned.
+ * for an entry with an identical key. The first matching entry is returned.
  *
  * Only use this function when you have other mechanisms guaranteeing
  * that the object won't go away after the RCU read lock is released.
@@ -682,7 +682,7 @@ static inline void *rhashtable_lookup_fast(
  * @params:	hash table parameters
  *
  * Computes the hash value for the key and traverses the bucket chain looking
- * for a entry with an identical key.  All matching entries are returned
+ * for an entry with an identical key.  All matching entries are returned
  * in a list.
  *
  * This must only be called under the RCU read lock.
@@ -699,7 +699,7 @@ static inline struct rhlist_head *rhltable_lookup(
 }
 
 /* Internal function, please use rhashtable_insert_fast() instead. This
- * function returns the existing element already in hashes in there is a clash,
+ * function returns the existing element already in hashes if there is a clash,
  * otherwise it returns an error via ERR_PTR().
  */
 static inline void *__rhashtable_insert_fast(
@@ -1130,7 +1130,7 @@ static inline int rhashtable_remove_fast(
  *
  * Since the hash chain is single linked, the removal operation needs to
  * walk the bucket chain upon removal. The removal operation is thus
- * considerable slow if the hash table is not correctly sized.
+ * considerably slower if the hash table is not correctly sized.
  *
  * Will automatically shrink the table if permitted when residency drops
  * below 30%