Fix spelling fuction -> function in comments

To avoid more patches, I also fixed other spelling
and grammar bugs when they were in the same or
following line:

successfull -> successful
parse -> parses
controler -> controller
controlers -> controllers

Cc: Jiri Kosina <trivial@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index df5dcd2..f0f82dc 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -3527,7 +3527,7 @@
  *      Stores a new ITR value based on strictly on packet size.  This
  *      algorithm is less sophisticated than that used in igb_update_itr,
  *      due to the difficulty of synchronizing statistics across multiple
- *      receive rings.  The divisors and thresholds used by this fuction
+ *      receive rings.  The divisors and thresholds used by this function
  *      were determined based on theoretical maximum wire speed and testing
  *      data, in order to minimize response time while increasing bulk
  *      throughput.