Fix pluralization

Summary:
This replaces "Recrawled this watch 1 times" with "Recrawled this watch 1 time".

X-link: facebook/watchman#1180

Reviewed By: genevievehelsel

Differential Revision: D52463712

fbshipit-source-id: 8b46f6f57836d562525606103972944b671e2c81

Author: dnicolson

third-party/watchman/src/watchman/root/threading.cpp

@@ -28,7 +28,9 @@ void Root::scheduleRecrawl(const char* why) {
         info->warning = w_string::build(
             "Recrawled this watch ",
             info->recrawlCount,
-            " times, most recently because:\n",
+            " time",
+            info->recrawlCount != 1 ? "s" : "",
+            ", most recently because:\n",
             why,
             "To resolve, please review the information on\n",
             cfg_get_trouble_url(),

third-party/watchman/src/website/docs/troubleshooting.md

@@ -56,7 +56,7 @@ macOS has a similar internal limit and behavior when that limit is exceeded. If
 you're encountering a message like:
 
 ```
-Recrawled this watch 1 times, most recently because:
+Recrawled this watch 1 time, most recently because:
 /some/path: kFSEventStreamEventFlagUserDropped
 ```