CLEANUP: assorted typo fixes in the code and comments

This is fifth iteration of typo fixes
diff --git a/contrib/modsecurity/spoa.c b/contrib/modsecurity/spoa.c
index 225db29..20916fd 100644
--- a/contrib/modsecurity/spoa.c
+++ b/contrib/modsecurity/spoa.c
@@ -197,7 +197,7 @@
 	DEBUG(frame->worker, "<%lu> Supported versions : %.*s",
 	      frame->client->id, (int)sz, str);
 
-	/* TODO: Find the right verion in supported ones */
+	/* TODO: Find the right version in supported ones */
 
 	ret  = (p - *buf);
 	*buf = p;