docs: Fix autocomplete instructions

Closes espressif#1138
Closes espressif#1139

Author: peterdragun

docs/en/installation.rst

@@ -103,9 +103,9 @@ You will likely have to restart or re-login for the autocompletion to start work
 
          .. code-block:: bash
 
-               eval "$(_ESPTOOL_PY_COMPLETE=bash_source esptool)"
-               eval "$(_ESPSECURE_PY_COMPLETE=bash_source espsecure)"
-               eval "$(_ESPEFUSE_PY_COMPLETE=bash_source espefuse)"
+               eval "$(_ESPTOOL_COMPLETE=bash_source esptool)"
+               eval "$(_ESPSECURE_COMPLETE=bash_source espsecure)"
+               eval "$(_ESPEFUSE_COMPLETE=bash_source espefuse)"
 
 
    .. group-tab:: Zsh
@@ -123,18 +123,18 @@ You will likely have to restart or re-login for the autocompletion to start work
 
       .. code-block:: bash
 
-         eval "$(_ESPTOOL_PY_COMPLETE=zsh_source esptool)"
-         eval "$(_ESPSECURE_PY_COMPLETE=zsh_source espsecure)"
-         eval "$(_ESPEFUSE_PY_COMPLETE=zsh_source espefuse)"
+         eval "$(_ESPTOOL_COMPLETE=zsh_source esptool)"
+         eval "$(_ESPSECURE_COMPLETE=zsh_source espsecure)"
+         eval "$(_ESPEFUSE_COMPLETE=zsh_source espefuse)"
 
 
    .. group-tab:: Fish
 
       .. code-block:: bash
 
-         _ESPTOOL_PY_COMPLETE=fish_source esptool | source
-         _ESPSECURE_PY_COMPLETE=fish_source espsecure | source
-         _ESPEFUSE_PY_COMPLETE=fish_source espefuse | source
+         _ESPTOOL_COMPLETE=fish_source esptool | source
+         _ESPSECURE_COMPLETE=fish_source espsecure | source
+         _ESPEFUSE_COMPLETE=fish_source espefuse | source