Merge pull request #2817 from AntonOks/patch-1

adding keyring hint to the install.sh help page
merged-on-behalf-of: Sebastian Wilzbach <sebi.wilzbach@gmail.com>

Author: dlang-bot

install.dd

@@ -309,7 +309,7 @@ $(CONSOLE
 
 $(H3 $(LNAME2 update, Update))
 
-Update the installer itself.
+Update the installer itself and the keyring.
 
 $(CONSOLE
 ~/dlang/install.sh update