changing sentences

subjects/islower/README.md

@@ -2,7 +2,7 @@
 
 ### Instructions
 
-Write a function that returns 'true' if the 'string' passed as the parameter contains only lowercase characters; returns 'false' otherwise.
+Write a function that returns `true` if the `string` passed as the parameter contains only lowercase characters, otherwise, returns `false`.
 
 ### Expected function