Add Command trait method documentation and other docstrings, make p.co and p.d commands be used from the middle of a message

src/groups/about/commands.rs

@@ -92,6 +92,10 @@ impl Command<State, Extras> for CodeOfConductCommand {
         false
     }
 
+    fn only_runs_if_startswith(&self) -> bool {
+        false
+    }
+
     async fn execute(
         &self,
         ctx: CommandContext<'_, State, Extras>,
@@ -126,6 +130,10 @@ impl Command<State, Extras> for DonateCommand {
         false
     }
 
+    fn only_runs_if_startswith(&self) -> bool {
+        false
+    }
+
     async fn execute(
         &self,
         ctx: CommandContext<'_, State, Extras>,