doc: modules involving file transfert bypass pipelining (#37250)

* doc: modules involving file transfert bypass pipelining

* Fixed typo

docs/docsite/rst/user_guide/become.rst

@@ -149,8 +149,9 @@ Ways to resolve this include:
 
 * Use `pipelining`.  When pipelining is enabled, Ansible doesn't save the
   module to a temporary file on the client.  Instead it pipes the module to
-  the remote python interpreter's stdin.  Pipelining does not work for
-  non-python modules.
+  the remote python interpreter's stdin. Pipelining does not work for
+  python modules involving file transfer (for example: :ref:`copy <copy>`,
+  :ref:`fetch <fetch>`, :ref:`template <template>`), or for non-python modules.
 
 * (Available in Ansible 2.1) Install POSIX.1e filesystem acl support on the
   managed host.  If the temporary directory on the remote host is mounted with