Merge pull request #13383 from hurf/label_drun

Add --dry-run option for label command

docs/man/man1/kubectl-label.1

@@ -26,6 +26,10 @@ If \-\-resource\-version is specified, then updates will use this resource versi
 \fB\-\-all\fP=false
     select all resources in the namespace of the specified resource types
 
+.PP
+\fB\-\-dry\-run\fP=false
+    If true, only print the object that would be sent, without sending it.
+
 .PP
 \fB\-f\fP, \fB\-\-filename\fP=[]
     Filename, directory, or URL to a file identifying the resource to update the labels