Spelling fixes in comments, documentation, tests and examples

By klemens <ka7@github.com>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/ash_test/ash-misc/unicode1.tests b/shell/ash_test/ash-misc/unicode1.tests
index 8788ba9..b8479cb 100755
--- a/shell/ash_test/ash-misc/unicode1.tests
+++ b/shell/ash_test/ash-misc/unicode1.tests
@@ -5,7 +5,7 @@
 # Should print 1
 echo ${#a}
 
-# A Japanese katakana charachter U+30a3
+# A Japanese katakana character U+30a3
 a=`printf "\xe3\x82\xa3"`
 # Should print 1
 echo ${#a}