Update .gitmodules

Author: sergey-signal

.gitmodules

@@ -1,11 +1,11 @@
-# Note that the implementation of the abusive message filter is private; internal
+# Note that the implementation of the spam filter is private; internal
 # developers will need to override this URL with:
 #
 # ```
-# git config submodule.abusive-message-filter.url PRIVATE_URL
+# git config submodule.spam-filter.url PRIVATE_URL
 # ```
 #
 # External developers may safely ignore this submodule.
-[submodule "abusive-message-filter"]
+[submodule "spam-filter"]
 	path = spam-filter
 	url = REDACTED