Add an EXAMPLES section.

Xref sh(1) as we use environment variables.

PR:		43899
Reviewed by:	des

usr.bin/fetch/fetch.1

@@ -228,7 +228,36 @@ connection.
 All environment variables mentioned in the documentation for the
 .Xr fetch 3
 library are supported.
+.Sh EXAMPLES
+The various authentication mechanisms can be set using the
+following examples:
+.Pp
+If a proxy needed to be accessed on example.com
+than
+.Pp
+.Dv export HTTP_PROXY=http://trhodes:xxxxxx@proxy.example.com:8080
+.Pp
+should be used, where
+.Dq trhodes:xxxxxx
+would be the applicable username and password,
+.Dq example.com
+would be the domain name and
+.Dq portnum
+would be the required port number.
+The
+.Em HTTP_PROXY
+option uses:
+.Pp
+.Dv HTTP_PROXY="http://proxy.example.com:8080/"
+.Pp
+and
+.Em HTTP_PROXY_AUTH
+option would use the following example:
+.Pp
+.Dv export HTTP_PROXY_AUTH="basic:*:<user>:<password>"
+.Pp
 .Sh SEE ALSO
+.Xr sh 1 ,
 .Xr fetch 3
 .Sh HISTORY
 The