tree-wide: Assorted spelling fixes

In particular, several occurances of funny versions of 'success',
'unknown', 'therefore', 'acknowledge', 'argument', 'achieve', 'address',
'beginning', 'desirable', 'separate' and 'necessary' are fixed.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Joe Perches <joe@perches.com>
Cc: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index e8daf5c..44408c2 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -321,7 +321,7 @@
 			new_depth_mask &= ~(1 << (depth - 1));
 
 		/*
-		 * But we keep the older depth mask for the line seperator
+		 * But we keep the older depth mask for the line separator
 		 * to keep the level link until we reach the last child
 		 */
 		ret += ipchain__fprintf_graph_line(fp, depth, depth_mask,