doc: fix DrahtBot LLM Linter error

Possible typos and grammar issues:

- “try unregister this callback” -> “try to unregister this callback” [missing “to” for infinitive]

#186 (comment)

Author: ryanofsky

src/mp/proxy.cpp

@@ -321,7 +321,7 @@ std::tuple<ConnThread, bool> SetThread(ConnThreads& threads, std::mutex& mutex,
 
         // Connection is being destroyed before thread client is, so reset
         // thread client m_disconnect_cb member so thread client destructor does not
-        // try unregister this callback after connection is destroyed.
+        // try to unregister this callback after connection is destroyed.
         // Remove connection pointer about to be destroyed from the map
         const std::unique_lock<std::mutex> lock(mutex);
         thread->second.m_disconnect_cb.reset();