Add cider-find-keyword to the user manual

Author: vemv

doc/modules/ROOT/pages/config/basic_config.adoc

@@ -31,7 +31,7 @@ buffers. You can override this behavior, however:
 
 https://github.com/clojure-emacs/enrich-classpath[`enrich-classpath`] is a program/plugin/wrapper that allows CIDER to access to the sources and javadocs of a given project's Java files: your own files, those from your dependencies, and those from the JDK.
 
-With that, CIDER can show better completions, navigation, documentation, and stacktrace integration.
+With that, CIDER can show better completions, navigation, documentation, stacktrace and Inspector integration.
 
 For Lein users, it has the additional benefit of running a single JVM, instead of the two JVMs that Lein programs typically involve.
 

doc/modules/ROOT/pages/usage/cider_mode.adoc

@@ -264,6 +264,10 @@ kbd:[C-c C-t C-b]
 | kbd:[M-.]
 | Jump to the definition of a symbol.  If invoked with a prefix argument it inverts the value of `cider-prompt-for-symbol`.
 
+| `cider-find-keyword`
+| kbd:[C-c C-:]
+| Find the namespace of the keyword at point and its primary occurrence there.  If invoked with a prefix argument it inverts the value of `cider-prompt-for-symbol`.
+
 | `cider-find-dwim-at-mouse`
 | kbd:[mouse-5] or kbd:[mouse-9]
 | Jump to the definition of a symbol using mouse.