Update CLI docs to clarify that --version only applies to the root command (#1326)

Author: HT154

docs/modules/pkl-cli/pages/index.adoc

@@ -788,6 +788,17 @@ The <<command-eval>>, <<command-test>>, <<command-repl>>, <<command-download-pac
 
 include::../../pkl-cli/partials/cli-project-options.adoc[]
 
+[[root-options]]
+=== Root options
+
+The root `pkl` command supports the following options:
+
+.-v, --version
+[%collapsible]
+====
+Display version information.
+====
+
 == Evaluating Modules
 
 Say we have the following module:

docs/modules/pkl-cli/partials/cli-common-options.adoc

@@ -109,12 +109,6 @@ Duration, in seconds, after which evaluation of a source module will be timed ou
 Note that a timeout is treated the same as a program error in that any subsequent source modules will not be evaluated.
 ====
 
-.-v, --version
-[%collapsible]
-====
-Display version information.
-====
-
 .-w, --working-dir
 [%collapsible]
 ====