doc: fix formatting.

Fix formatting:

Change one example quoting info from another doc to blockquote not
highlighed pre block.

use :: to force some examples to be highighted.

Use '.. code-block:: text' to force no highlighting for plain text
example blocks.

Author: rouilj

doc/upgrading.txt

@@ -1159,7 +1159,7 @@ will take longer but may be worth trying if the ``exporttables`` and
 Another way that should be faster, but is untested is to use mysql
 dump to dump the database.
 https://makandracards.com/makandra/595-dumping-and-importing-from-to-mysql-in-an-utf-8-safe-way
-recommends::
+recommends:
 
    Note that when your MySQL server is not set to UTF-8 you need to do
    mysqldump --default-character-set=latin1 (!) to get a correctly
@@ -1238,6 +1238,8 @@ If you do not modify the ``user.register.html`` template in your
 tracker's html directory, you *must* set this to 0. Otherwise you will
 see the error:
 
+.. code-block:: text
+
   Form is corrupted, missing: opaqueregister.
 
 If set to 0, the rate limit check is disabled.
@@ -1630,6 +1632,8 @@ Errors and Troubleshooting - AttributeError list object no attribute value
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 If you get an error:
 
+.. code-block:: text
+
   AttributeError: 'list' object has no attribute 'value'
 
 in handle_csrf, you have more than one @csrf token for the form. This
@@ -2150,7 +2154,7 @@ not need it.
 Changes to property permissions
 -------------------------------
 
-If you create a permission:
+If you create a permission::
 
     db.security.addPermission(name='View', klass='user',
        properties=['theme'], check=own_record,
@@ -2177,7 +2181,7 @@ user expects to see the results of the query. But now that
 the code properly checks for duplicate search names, the user should
 stay on the search page if there is an error. To add this to your
 existing issue.search.html page, add the following line after the
-hidden field @old-queryname:
+hidden field ``@old-queryname``::
 
   <input type="hidden" name="@template" value="index|search"/>