fix: address codex review findings (docs part)

Author: lavr

docs/api.rst

@@ -87,7 +87,7 @@ Message Methods
 .. method:: Message.send_async(to=None, set_mail_to=True, mail_from=None, set_mail_from=False, render=None, smtp_mail_options=None, smtp_rcpt_options=None, smtp=None)
 
    Send the message via SMTP asynchronously. Requires ``aiosmtplib``
-   (install with ``pip install emails[async]``).
+   (install with ``pip install "emails[async]"``).
 
    Parameters are the same as :meth:`send`, except ``smtp`` accepts a dict
    or an :class:`AsyncSMTPBackend` instance.
@@ -323,7 +323,7 @@ AsyncSMTPBackend
 ----------------
 
 For async sending via :meth:`Message.send_async`. Requires ``aiosmtplib``
-(install with ``pip install emails[async]``).
+(install with ``pip install "emails[async]"``).
 
 .. class:: emails.backend.smtp.aio_backend.AsyncSMTPBackend(ssl=False, fail_silently=True, mail_options=None, \*\*kwargs)
 
@@ -470,7 +470,7 @@ template instance as the ``html``, ``text``, or ``subject`` parameter of
 
 Install template dependencies with extras::
 
-    pip install emails[jinja]   # for JinjaTemplate
+    pip install "emails[jinja]"   # for JinjaTemplate
 
 .. class:: emails.template.JinjaTemplate(template_text, environment=None)
 

docs/examples.rst

@@ -32,7 +32,7 @@ Attach files or inline images:
     message.attach(data=open('image.png', 'rb'), filename='image.png',
                    content_disposition='inline')
 
-Use templates (requires ``pip install emails[jinja]``):
+Use templates (requires ``pip install "emails[jinja]"``):
 
 .. code-block:: python
 

docs/install.rst

@@ -13,16 +13,16 @@ To use HTML transformation features (CSS inlining, image embedding, loading from
 
 .. code-block:: bash
 
-    $ pip install emails[html]
+    $ pip install "emails[html]"
 
 To use Jinja2 templates (the ``T()`` shortcut):
 
 .. code-block:: bash
 
-    $ pip install emails[jinja]
+    $ pip install "emails[jinja]"
 
 To use async sending (``send_async()``):
 
 .. code-block:: bash
 
-    $ pip install emails[async]
+    $ pip install "emails[async]"

docs/quickstart.rst

@@ -197,7 +197,7 @@ with the same variables.
 
 Jinja2 templates require the ``jinja2`` package. Install it with::
 
-    pip install emails[jinja]
+    pip install "emails[jinja]"
 
 Two other template backends are available: