Spelling fix

Author: Erman Okman

izer/assets.py

@@ -282,7 +282,7 @@ class MakefileMapping(MutableMapping):
     'SRCS +=', etc. is done "on the fly" through this mapping object.
 
     The key:value rules are as follows:
-        * The key is lowercase, and any '.' is replaced is '_'. (revelant for JSON parsing)
+        * The key is lowercase, and any '.' is replaced is '_'. (relevant for JSON parsing)
 
         * The value is a tuple with 2 items:
             * index 0: The template string