fix(strings): differentiate setup(n) and set(v) up (#905)

Author: systemcrash

users/faq-parts/troubleshooting.rst

@@ -74,7 +74,7 @@ system's CPU power.
 Why is the setup more complicated than BitTorrent/Resilio Sync?
 ---------------------------------------------------------------
 
-Security over convenience. In Syncthing you have to setup both sides to
+Security over convenience. In Syncthing you have to set up both sides to
 connect two devices. An attacker can't do much with a stolen device ID, because
 you have to add the device on the other side too. You have better control
 where your files are transferred.

users/faq-parts/usage.rst

@@ -241,7 +241,7 @@ You are probably reading this because you encountered the following error with
 the filesystem watcher on linux:
 
     Failed to start filesystem watcher for folder yourLabel (yourID): failed to
-    setup inotify handler. Please increase inotify limits, see https://docs.syncthing.net/users/faq.html#inotify-limits
+    set up inotify handler. Please increase inotify limits, see https://docs.syncthing.net/users/faq.html#inotify-limits
 
 Linux typically restricts the number of watches per user (usually 8192). If
 you have many directories, you will need to adjust that number.