added a link to bash "internal read" documentation with example

SC2162.md

@@ -20,8 +20,10 @@ By default, `read` will interpret backslashes before spaces and line feeds, and
 
 Normally you just want to read data, which is what `read -r` does. You should always use `-r` unless you have a good reason not to.
 
-Note that `read -r` will still strip leading and trailing spaces. `IFS="" read -r` prevents this.
+Note that [`read -r`](https://www.tldp.org/LDP/abs/html/internal.html#READR) will still strip leading and trailing spaces. `IFS="" read -r` prevents this.
 
 ### Exceptions:
 
 If you want backslashes to affect field splitting and line terminators instead of being read, you can disable this message with a [[directive]].
+
+[1] https://www.tldp.org/LDP/abs/html/internal.html#READR