CLEANUP: assorted typo fixes in the code and comments

This is 10th iteration of typo fixes
diff --git a/src/fcgi-app.c b/src/fcgi-app.c
index 3f315a6..212ea23 100644
--- a/src/fcgi-app.c
+++ b/src/fcgi-app.c
@@ -62,7 +62,7 @@
 	return ist2(dst, ofs1);
 }
 
-/* Returns a pointer to the FCGi applicatrion mathing the name <name>. NULL is
+/* Returns a pointer to the FCGi application matching the name <name>. NULL is
  * returned if no match found.
  */
 struct fcgi_app *fcgi_app_find_by_name(const char *name)