Fix grammar

Author: zohairawan

src/strings_ii/check_if_blank.md

@@ -2,8 +2,7 @@
 
 You can check if a `String` is blank by using the `.isBlank` method.
 
-The difference is that an empty `String` has actually zero characters. A blank `String`
-is can have characters, so long as those characters are what we would consider whitespace.
+The difference is that an empty `String` has actually zero characters. A blank `String` can have characters, so long as those characters are what we would consider whitespace.
 That is, things like spaces and newlines.
 
 ```java