spelling: support

(cherry picked from commit 2e6f56a)

Conflicts:
	src/rabbit_fifo.erl

Author: jsoref

src/rabbit_priority_queue.erl

@@ -53,7 +53,7 @@
 -define(passthrough3(F),
         {Res1, Res2, BQS1} = BQ:F, {Res1, Res2, State#passthrough{bqs = BQS1}}).
 
-%% This module adds suport for priority queues.
+%% This module adds support for priority queues.
 %%
 %% Priority queues have one backing queue per priority. Backing queue functions
 %% then produce a list of results for each BQ and fold over them, sorting