docs: Changes: pip install --user

Author: tony

CHANGES

@@ -294,7 +294,7 @@ This will be the last Python 2.7 release of tmuxp. Bug fixes for python
 
   ```{code-block} sh
 
-  $ pip install ipdb
+  $ pip install --user ipdb
   $ env PYTHONBREAKPOINT=ipdb.set_trace tmuxp shell
 
   ```

docs/cli.md

@@ -80,9 +80,8 @@ compatible debuggers, for instance [ipdb][ipdb]:
 
 ```{code-block} sh
 
-$ pip install ipdb
+$ pip install --user ipdb
 $ env PYTHONBREAKPOINT=ipdb.set_trace tmuxp shell
-
 ```
 
 You can also pass in python code directly, similar to `python -c`, do

docs/quickstart.md

@@ -8,15 +8,15 @@ Assure you have at least tmux **>= 1.8** and python **>= 2.6**.
 
 ```{code-block} bash
 
-$ pip install tmuxp
+$ pip install --user tmuxp
 
 ```
 
 You can upgrade to the latest release with:
 
 ```{code-block} bash
 
-$ pip install tmuxp -U
+$ pip install --user tmuxp -U
 
 ```