add link to docs

Author: bpmct

.tours/contributing.tour

@@ -50,7 +50,7 @@
     {
       "file": "src/node/heart.ts",
       "line": 7,
-      "description": "code-server's heart beats to indicate recent activity."
+      "description": "code-server's heart beats to indicate recent activity.\n\nAlso documented here: [https://github.com/cdr/code-server/blob/master/doc/FAQ.md#heartbeat-file](https://github.com/cdr/code-server/blob/master/doc/FAQ.md#heartbeat-file)"
     },
     {
       "file": "src/node/socket.ts",
@@ -80,12 +80,12 @@
     {
       "file": "src/node/routes/domainProxy.ts",
       "line": 18,
-      "description": "code-server provides a built-in proxy to help in developing web-based applications. This is the code for the domain-based proxy."
+      "description": "code-server provides a built-in proxy to help in developing web-based applications. This is the code for the domain-based proxy.\n\nAlso documented here: [https://github.com/cdr/code-server/blob/master/doc/FAQ.md#how-do-i-securely-access-web-services](https://github.com/cdr/code-server/blob/master/doc/FAQ.md#how-do-i-securely-access-web-services)"
     },
     {
       "file": "src/node/routes/pathProxy.ts",
       "line": 19,
-      "description": "Here is the path-based version of the proxy."
+      "description": "Here is the path-based version of the proxy.\n\nAlso documented here: [https://github.com/cdr/code-server/blob/master/doc/FAQ.md#how-do-i-securely-access-web-services](https://github.com/cdr/code-server/blob/master/doc/FAQ.md#how-do-i-securely-access-web-services)"
     },
     {
       "file": "src/node/proxy.ts",
@@ -95,7 +95,7 @@
     {
       "file": "src/node/routes/health.ts",
       "line": 5,
-      "description": "A simple endpoint that lets you see if code-server is up."
+      "description": "A simple endpoint that lets you see if code-server is up.\n\nAlso documented here: [https://github.com/cdr/code-server/blob/master/doc/FAQ.md#healthz-endpoint](https://github.com/cdr/code-server/blob/master/doc/FAQ.md#healthz-endpoint)"
     },
     {
       "file": "src/node/routes/login.ts",