number formatting fix

doc/install/requirements.md

@@ -85,7 +85,7 @@ Redis stores all user sessions and the background task queue.
 The storage requirements for Redis are minimal, about 25kB per user.
 Sidekiq processes the background jobs with a multithreaded process.
 This process starts with the entire Rails stack (200MB+) but it can grow over time due to memory leaks.
-On a very active server (10.000 active users) the Sidekiq process can use 1GB+ of memory.
+On a very active server (10,000 active users) the Sidekiq process can use 1GB+ of memory.
 
 ## Supported webbrowsers