Added backticks

Author: VinithKrishnan

src/identifiers.md

@@ -4,25 +4,25 @@ An identifier is any nonempty Unicode[^non_ascii_idents] string of the following
 
 Either
 
-   * The first character has property [XID_start]
-   * The remaining characters have property [XID_continue]
+   * The first character has property [`XID_start`]
+   * The remaining characters have property [`XID_continue`]
 
 Or
 
    * The first character is `_`
    * The identifier is more than one character, `_` alone is not an identifier
-   * The remaining characters have property [XID_continue]
+   * The remaining characters have property [`XID_continue`]
 
 that does _not_ occur in the set of [keywords].
 
-> **Note**: [XID_start] and [XID_continue] as character properties cover the
+> **Note**: [`XID_start`] and [`XID_continue`] as character properties cover the
 > character ranges used to form the more familiar C and Java language-family
 > identifiers.
 
 
 
-[XID_start]:  http://unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3AXID_Start%3A%5D&abb=on&g=&i=
-[XID_continue]: http://unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3AXID_Continue%3A%5D&abb=on&g=&i=
+[`XID_start`]:  http://unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3AXID_Start%3A%5D&abb=on&g=&i=
+[`XID_continue`]: http://unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3AXID_Continue%3A%5D&abb=on&g=&i=
 [keywords]: ../grammar.html#keywords
 [^non_ascii_idents]: Non-ASCII characters in identifiers are currently feature
   gated. This is expected to improve soon.