Fixed inconsistent spelling of "newline"

"newline" was spelled as "new-line" two out of four times in the document.

Author: weijuwang

docs/c-language/lexical-grammar.md

@@ -250,14 +250,14 @@ For a list of additional Microsoft-specific keywords, see [C keywords](./c-keywo
  *`h-char-sequence`* *`h-char`*
 
 *`h-char`*:\
- any member of the source character set except the new-line character and **`>`**
+ any member of the source character set except the newline character and **`>`**
 
 *`q-char-sequence`*:\
  *`q-char`*\
  *`q-char-sequence`* *`q-char`*
 
 *`q-char`*:\
- any member of the source character set except the new-line character and **`"`**
+ any member of the source character set except the newline character and **`"`**
 
 ## Preprocessing numbers