recommend installation with srv (pymongo) (#727)

* DOCS-14274: install pymongo with srv option

* proper quoting

Author: terakilobyte

source/pymongo.txt

@@ -48,19 +48,19 @@ pymongo on all platforms:
 
 .. code-block:: sh
 
-   $ python -m pip install pymongo
+   $ python -m pip install 'pymongo[srv]'
 
 To get a specific version of pymongo:
 
 .. code-block:: sh
 
-   $ python -m pip install pymongo==3.11
+   $ python -m pip install 'pymongo[srv]'==3.11
 
 To upgrade using pip:
 
 .. code-block:: sh
 
-   $ python -m pip install --upgrade pymongo
+   $ python -m pip install --upgrade 'pymongo[srv]'
 
 
 See `Installation <https://pymongo.readthedocs.io/en/stable/installation.html>`__