docs: fix examples

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---

Author: kgryte

lib/node_modules/@stdlib/net/http2-secure-server/README.md

@@ -35,6 +35,8 @@ var http2ServerFactory = require( '@stdlib/net/http2-secure-server' );
 Returns a function to create an [HTTP/2][nodejs-http2] server.
 
 ```javascript
+var readFileSync = require( '@stdlib/fs/read-file' ).sync;
+
 var opts = {
     'cert': readFileSync( resolve( __dirname, 'examples', 'localhost-cert.pem' ) ),
     'key': readFileSync( resolve( __dirname, 'examples', 'localhost-privkey.pem' ) )
@@ -50,6 +52,8 @@ The function supports the following parameters:
 To bind a request callback to a server, provide a `requestListener`.
 
 ```javascript
+var readFileSync = require( '@stdlib/fs/read-file' ).sync;
+
 function requestListener( request, response ) {
     console.log( request.url );
     response.end( 'OK' );
@@ -72,6 +76,8 @@ In addition to the options supported by [`http2.createSecureServer`][nodejs-http
 To specify server options, provide an options object.
 
 ```javascript
+var readFileSync = require( '@stdlib/fs/read-file' ).sync;
+
 var opts = {
     'port': 7331,
     'address': '0.0.0.0',
@@ -85,6 +91,8 @@ var http2Server = http2ServerFactory( opts );
 To specify a range of permissible ports, set the `maxport` option.
 
 ```javascript
+var readFileSync = require( '@stdlib/fs/read-file' ).sync;
+
 var opts = {
     'maxport': 9999,
     'cert': readFileSync( resolve( __dirname, 'examples', 'localhost-cert.pem' ) ),
@@ -101,6 +109,8 @@ When provided a `maxport` option, a created server will search for the first ava
 Creates an [HTTP/2][nodejs-http2] server.
 
 ```javascript
+var readFileSync = require( '@stdlib/fs/read-file' ).sync;
+
 function done( error, server ) {
     if ( error ) {
         throw error;