[Docs] Add a missing space

Author: bbatsov

doc/modules/ROOT/pages/index.adoc

@@ -74,7 +74,7 @@ CIDER packs plenty of features. Here are some of them (in no particular order):
 * `clojure.spec` integration
 * Interactive debugger
 * ClojureScript support
-* Support for xref:platforms/overview.adoc[alternative Clojure platforms](e.g. ClojureCLR, babashka, nbb & lumo)
+* Support for xref:platforms/overview.adoc[alternative Clojure platforms] (e.g. ClojureCLR, babashka, nbb & lumo)
 
 And many many more... The rest of this manual will be exploring CIDER's features in great detail.