More polish on the install docs

Author: jim-parry

user_guide_src/source/installation/index.rst

@@ -28,3 +28,5 @@ However you choose to install and run CodeIgniter4, the
 .. note:: Before using CodeIgniter 4, make sure that your server meets the
           :doc:`requirements </intro/requirements>`, in particular the PHP
           version and the PHP extensions that are needed.
+          You may find that you have to uncomment the ``php.ini`` "extension"
+          lines to enable "curl" and "intl", for instance.

user_guide_src/source/installation/installing_git.rst

@@ -1,14 +1,17 @@
 Git Installation
 ###############################################################################
 
+This would *not* be suitable for app development, but *is* suitable
+for contributing to the framework.
+
+Installation
+-------------------------------------------------------
+
 Install the latest version of the codebase by
 
 - forking the `codebase  <https://github.com/codeigniter4/CodeIgniter4>`_ to your github account
 - cloning **your** forked repository locally
 
-This would *not* be suitable for app development, but *is* suitable
-for contributing to the framework.
-
 Setup
 -------------------------------------------------------
 

user_guide_src/source/installation/running.rst

@@ -1,8 +1,7 @@
-################
 Running Your App
-################
+###############################################################################
 
-A CodeIgniter 4 app can be run in a number of different ways: using a web server,
+A CodeIgniter 4 app can be run in a number of different ways: hosted on a web server,
 using virtualization, or using CodeIgniter's command line tool for testing. 
 This section addresses how to use
 each technique, and explains some of the pros and cons of them.
@@ -13,10 +12,10 @@ Initial Configuration & Setup
 #. Open the **app/Config/App.php** file with a text editor and
    set your base URL. If you intend to use encryption or sessions, set
    your encryption key. If you need more flexibility, the baseURL may
-   be set within the .env file as **app.baseURL="http://example.com"**.
+   be set within the ``.env`` file as **app.baseURL="http://example.com"**.
 #. If you intend to use a database, open the
    **app/Config/Database.php** file with a text editor and set your
-   database settings.
+   database settings. Alternately, these could be set in your ``.env`` file.
 
 One additional measure to take in production environments is to disable
 PHP error reporting and any other development-only functionality. In