Merge branch 'installation-backend-pip-mxdev' of github.com:plone/documentation into installation-backend-pip-mxdev

Author: ksuess

docs/glossary.md

@@ -48,7 +48,7 @@ Linode
 
 mxdev
     [mxdev](https://github.com/mxstack/mxdev) [mɪks dɛv] is a utility that makes it easy to work with Python projects containing lots of packages, of which you only want to develop some.
-    It builds on top of the idea to have stable version constraints and then develop from a VCS on top of it.
+    It is designed for developers who use stable version constraints, then layer their customizations on top of that base while using a version control system.
     This design allows developers to override their base package constraints with a customized or newer version.
 
 mxmake

docs/install/source-step-by-step.md

@@ -168,9 +168,6 @@ default_context:
     db_storage: direct
 ```
 
-
-
-
 Add-ons are listed here to be loaded by `Zope` app. As python packages they also need to be installed with pip.
 The documented installation of add-ons with pip is achieved via a {file}`requirements.txt` file.
 We list an add-on like for example `collective.easyform` in\