Update welcome message and docs URL (#319)

Author: zooba

src/manage/commands.py

@@ -26,8 +26,7 @@
 DEFAULT_TAG = "3"
 
 
-# TODO: Remove the /dev/ for stable release
-HELP_URL = "https://docs.python.org/dev/using/windows"
+HELP_URL = "https://docs.python.org/using/windows"
 
 
 COPYRIGHT = f"""Python installation manager {__version__}
@@ -41,9 +40,9 @@
 
 WELCOME = f"""!B!Python install manager was successfully updated to {__version__}.!W!
 
-This update adds global shortcuts for installed scripts such as !G!pip.exe!W!.
-Use !G!py install --refresh!W! to update all shortcuts.
-!Y!This will be needed after installing new scripts, as it is not run automatically.!W!
+Indexes can now be signed to provide tamper detection. When an index signature
+is found to be invalid, the operation will be aborted without modifying your system.
+See !B!{HELP_URL}#index-signatures!W! for more information.
 """
 
 # The 'py help' or 'pymanager help' output is constructed by these default docs,