Fix whitespace problems

snippets/join.md

@@ -15,7 +15,6 @@ Uses a separator and an end separator.
 - Omit the third argument, `end`, to use the same value as `separator` by default.
 
 ```js
-
 const join = (arr, separator = ',', end = separator) =>
   arr.reduce(
     (acc, val, i) =>

snippets/remove.md

@@ -14,7 +14,6 @@ Mutates an array by removing elements for which the given function returns `fals
 - The callback function is invoked with three arguments (value, index, array).
 
 ```js
-
 const remove = (arr, func) =>
   Array.isArray(arr)
     ? arr.filter(func).reduce((acc, val) => {

snippets/size.md

@@ -16,7 +16,6 @@ Gets the size of an array, object or string.
 - Split strings into array of characters with `String.prototype.split()` and return its length.
 
 ```js
-
 const size = val =>
   Array.isArray(val)
     ? val.length