add ansible-galaxy cli documentation for parallel execution (#79433)

* add ansible-galaxy cli documentation for parallel execution

Co-authored-by: saranti <tsarantis@proton.me>

* Update lib/ansible/cli/galaxy.py

* Update lib/ansible/cli/galaxy.py

Co-authored-by: Sviatoslav Sydorenko <wk.cvs.github@sydorenko.org.ua>

Co-authored-by: saranti <tsarantis@proton.me>
Co-authored-by: Sviatoslav Sydorenko <wk.cvs.github@sydorenko.org.ua>

lib/ansible/cli/galaxy.py

@@ -197,7 +197,11 @@ class RoleDistributionServer:
 
 
 class GalaxyCLI(CLI):
-    '''command to manage Ansible roles in shared repositories, the default of which is Ansible Galaxy *https://galaxy.ansible.com*.'''
+    '''Command to manage Ansible roles and collections.
+
+       None of the CLI tools are designed to run concurrently with themselves.
+       Use an external scheduler and/or locking to ensure there are no clashing operations.
+    '''
 
     name = 'ansible-galaxy'