updated the docs with difference between the whitespace and /s

Author: yours7himanshu

.gitignore

@@ -96,6 +96,7 @@ Desktop.ini
 # Node.js #
 ###########
 /node_modules/
+node_modules
 lib/node_modules/**/node_modules/
 docs/**/node_modules/
 pids

docs/style-guides/javascript/README.md

@@ -73,6 +73,8 @@ Hopefully, most of the conventions outlined below will help enable you to do so.
 
 -   Even if you must use spaces, **never** mix tabs and spaces. This is formatting hell, as a simple find-and-replace is useless in the face of such chaos.
 
+- For developers using the `@stdlib/regexp/whitespace` utility, note that it treats the NEL Unicode character (`\u0085`) as whitespace, unlike ECMAScript's `\s`. This may cause discrepancies in whitespace-sensitive code.
+
 ##### Enforcement
 
 This project contains an [`.editorconfig`][editorconfig] file to be used in conjunction with IDE and/or browser plugins.