Fix example output (nginx#864)

Problem: The example output in the http-header-filter 
and https-termination examples are outdated.

Solution: Updated the example output to match the actual output.

Author: miledxz

examples/http-header-filter/README.md

@@ -64,7 +64,7 @@ Headers:
   header 'Accept-Encoding' is 'compress'
   header 'My-cool-header' is 'my-client-value, this-is-an-appended-value'
   header 'My-Overwrite-Header' is 'this-is-the-only-value'
-  header 'Host' is 'echo.example.com'
+  header 'Host' is 'echo.example.com:$GW_PORT'
   header 'Connection' is 'close'
   header 'Accept' is '*/*'
 ```

examples/https-termination/README.md

@@ -109,7 +109,7 @@ To get a redirect for coffee:
 curl --resolve cafe.example.com:$GW_HTTP_PORT:$GW_IP http://cafe.example.com:$GW_HTTP_PORT/coffee --include
 HTTP/1.1 302 Moved Temporarily
 ...
-Location: https://cafe.example.com:443/coffee
+Location: https://cafe.example.com/coffee
 ...
 ```
 
@@ -119,7 +119,7 @@ To get a redirect for tea:
 curl --resolve cafe.example.com:$GW_HTTP_PORT:$GW_IP http://cafe.example.com:$GW_HTTP_PORT/tea --include
 HTTP/1.1 302 Moved Temporarily
 ...
-Location: https://cafe.example.com:443/tea
+Location: https://cafe.example.com/tea
 ...
 ```