DOCSP-50960: Install with pie (#278)

* DOCSP-50960: Install with pie

* edits

* RR feedback

* JT feedback

Author: norareidy

source/get-started.txt

@@ -58,32 +58,27 @@ Download and Install
 
       - :php:`PHP <install>` version 7.4 or later
       - `Composer <https://getcomposer.org/download/>`__ version 2.0 or later
+      - :github:`pie </php/pie/blob/main/docs/usage.md>`
 
    .. step:: Install the MongoDB PHP extension
 
       Run the following command to install the ``mongodb`` PHP extension:
 
       .. code-block:: bash
 
-         sudo pecl install mongodb
+         pie install mongodb/mongodb-extension
 
-   .. step:: Update your PHP configuration file
+      .. tip:: Specify the PHP Extension Version
 
-      To enable the ``mongodb`` extension in your PHP configuration file, add the
-      following line to the top of your ``php.ini`` file:
-
-      .. code-block:: none
-
-         extension=mongodb.so
-
-      .. tip::
-
-         You can locate your ``php.ini`` file by running the following command
-         in your shell:
+         To install a specific version of the {+extension-short+}, include
+         the version number as shown in the following command:
 
          .. code-block:: bash
 
-            php --ini
+            pie install mongodb/mongodb-extension:^{+full-version+}
+
+         To install a {+extension-short+} version before v1.21, you must
+         use the :php:`pecl command <mongodb.installation#mongodb.installation.pecl>`.
 
    .. step:: Create a project directory
 

source/references/upgrade.txt

@@ -58,7 +58,16 @@ directory:
 
 .. code-block:: bash
 
-   pecl upgrade mongodb-<version-number>
+   pie install mongodb/mongodb-extension:^<version-number>
+
+.. tip:: Previous PHP Extension Versions
+
+   To upgrade to a {+extension-short+} version before v1.21,
+   use the following command:
+
+   .. code-block:: bash
+
+      pecl upgrade mongodb-<version-number>
 
 To upgrade the PHP library version, replace ``<version-number>`` with the 
 version number you want to upgrade to and run the following command in your