Replace fluff added in github-linguist#4699 (github-linguist#4701)

* Replace fluff added in github-linguist#4699

Partially reverts 1551710.

See: https://github.com/github/linguist/pull/4699/files#r341981107

* Quickly strip whitespace before @pchaigno spots it

README.md

@@ -179,18 +179,8 @@ File and folder paths inside `.gitattributes` are calculated relative to the pos
 ```gitattributes
 # Example of a `.gitattributes` file which reclassifies `.rb` files as Java:
 *.rb linguist-language=Java
-```
-
-Be aware that `gitattribute` values cannot contain whitespace.
-If a language's name contains spaces, replace them with hyphens instead:
-
-```gitattributes
-# These lines won't work:
-*.glyphs linguist-language=OpenStep Property List
-*.glyphs linguist-language=OpenStep\ Property\ List
-*.glyphs linguist-language="OpenStep Property List"
 
-# But this line will:
+# Replace any whitespace in the language name with hyphens:
 *.glyphs linguist-language=OpenStep-Property-List
 ```