Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/net/rds/ib_send.c b/net/rds/ib_send.c
index c47a511..7c4dce8 100644
--- a/net/rds/ib_send.c
+++ b/net/rds/ib_send.c
@@ -355,7 +355,7 @@
  *
  * Conceptually, we have two counters:
  *  -	send credits: this tells us how many WRs we're allowed
- *	to submit without overruning the reciever's queue. For
+ *	to submit without overruning the receiver's queue. For
  *	each SEND WR we post, we decrement this by one.
  *
  *  -	posted credits: this tells us how many WRs we recently