jetbrains.idea-community: add IntelliJ keyword to the longDescription (#47650)

This should make it easier to find the package under the name
IntelliJ in eg. [1]

[1] https://nixos.org/nixos/packages.html#intellij

pkgs/applications/editors/jetbrains/default.nix

@@ -130,7 +130,8 @@ let
         longDescription = ''
           IDE for Java SE, Groovy & Scala development Powerful
           environment for building Google Android apps Integration
-          with JUnit, TestNG, popular SCMs, Ant & Maven.
+          with JUnit, TestNG, popular SCMs, Ant & Maven. Also known
+          as IntelliJ.
         '';
         maintainers = with maintainers; [ edwtjo ];
         platforms = platforms.linux;