Update EscapeRegExpPattern.md

Author: benjamingr

data/EscapeRegExpPattern.md

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+See [this issue](https://github.com/benjamingr/RegExp.escape/issues/26#issuecomment-113572232) for more details. In short:
 
 
+ - EscapeRegExpPattern (as the name implies) takes a pattern and escapes it so that it can be represented as a string.
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+ - What RegExp.escape does is take a string and escapes it so it can be literally represented as a pattern.
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+---------------
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 ECMA 2015 specifies usage of [EscapeRegExpPattern](http://www.ecma-international.org/ecma-262/6.0/index.html#sec-escaperegexppattern)
 It's being used in [RegExp.prototype.source](http://www.ecma-international.org/ecma-262/6.0/index.html#sec-get-regexp.prototype.source)