Rename label "Current version" -> "Latest stable version"

Arvados-DCO-1.1-Signed-off-by: Peter Amstutz <[email protected]>

Author: tetron

CommandLineTool.yml

@@ -15,7 +15,7 @@ $graph:
       This version:
         * https://w3id.org/cwl/v1.2.0-dev5/
 
-      Current version:
+      Latest stable version:
         * https://w3id.org/cwl/
     - "\n\n"
     - {$include: contrib.md}

Workflow.yml

@@ -16,7 +16,7 @@ $graph:
       This version:
         * https://w3id.org/cwl/v1.2.0-dev5/
 
-      Current version:
+      Latest stable version:
         * https://w3id.org/cwl/
     - "\n\n"
     - {$include: contrib.md}