fix up links to point to the right spot

Summary: The links currently 404 and redirect to `https://code.facebook.com`. Doh.

Test Plan: Inspection

Reviewers: wez

Reviewed By: wez

Differential Revision: https://phabricator.fb.com/D1505678

docs/troubleshooting.markdown

@@ -64,7 +64,7 @@ A non-recoverable condition has triggered.  Watchman needs your help!
 The triggering condition was at timestamp=1407695600: inotify-add-watch(/my/path) -> Cannot allocate memory
 All requests will continue to fail with this message until you resolve
 the underlying problem.  You will find more information on fixing this at
-https://facebook.github.io/watchman/troubleshooting.html#poison-inotify-add-watch
+https://facebook.github.io/watchman/docs/troubleshooting.html#poison-inotify-add-watch
 ```
 
 If you've encountered this state it means that your *kernel* was unable to

listener.c

@@ -401,7 +401,7 @@ void add_root_warnings_to_response(json_t *response, w_root_t *root) {
     "Recrawled this watch %d times, most recently because:\n"
     "%.*s\n"
     "To resolve, please review the information on\n"
-    "https://facebook.github.io/watchman/troubleshooting.html#recrawl",
+    "https://facebook.github.io/watchman/docs/troubleshooting.html#recrawl",
     root->recrawl_count,
     root->last_recrawl_reason->len,
     root->last_recrawl_reason->buf));

root.c

@@ -1326,7 +1326,7 @@ void set_poison_state(w_root_t *root, struct watchman_dir *dir,
 "The triggering condition was at timestamp=%ld: %s(%.*s) -> %s\n"
 "All requests will continue to fail with this message until you resolve\n"
 "the underlying problem.  You will find more information on fixing this at\n"
-"https://facebook.github.io/watchman/troubleshooting.html#poison-%s\n",
+"https://facebook.github.io/watchman/docs/troubleshooting.html#poison-%s\n",
     now.tv_sec,
     syscall,
     dir->path->len,