docs(api): fix isBemEntityName arguments

blond · blond · commit 31fb8bead43e · 2016-12-18T14:23:26.000+03:00
diff --git a/README.md b/README.md
@@ -233,7 +233,7 @@ name.valueOf();
 // ➜ { block: 'button', mod: { name: 'focused', value: true } }
 ```
 
-### isBemEntityName()
+### isBemEntityName(entityName)
 
 Determines whether specified entity is instance of BemEntityName.
 
