minor #11641 Fix a few minor misprints in Mailer article (bocharsky-bw)

This PR was merged into the 4.3 branch.

Discussion
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Fix a few minor misprints in Mailer article

Just fixing a few minor misprints

Commits
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3fc6102 Fix a few minor misprints in Mailer article

Author: wouterj

mailer.rst

@@ -61,12 +61,12 @@ You'll now have a new line in your ``.env`` file that you can uncomment:
 
 .. code-block:: bash
 
-    # .env`
+    # .env
 
     SENDGRID_KEY=
     MAILER_DSN=smtp://$SENDGRID_KEY@sendgrid
 
-The``MAILER_DSN`` isn't a *real* SMTP address: it's a simple format that offloads
+The ``MAILER_DSN`` isn't a *real* SMTP address: it's a simple format that offloads
 most of the configuration work to mailer. The ``@sendgrid`` part of the address
 activates the SendGrid mailer library that you just installed, which knows all
 about how to deliver messages to SendGrid.