Remove Identifier String termination phrase (#485)

Fixes: #480

Author: danini-the-panini

SPEC.md

@@ -333,9 +333,6 @@ Identifiers that match these patterns _MUST_ be treated as a syntax error; such
 values can only be written as quoted or raw strings. The precise details of the
 identifier syntax is specified in the [Full Grammar](#full-grammar) below.
 
-Identifier Strings are terminated by [Whitespace](#whitespace), 
-[Newlines](#newline), or the end of the file/stream (an `EOF`).
-
 #### Non-initial characters
 
 The following characters cannot be the first character in an