PEP 505: Fix typo and markup

pep-0505.txt

@@ -88,7 +88,7 @@ an excerpt from the popular Requests package::
 
 This particular formulation has the undesirable effect of putting the operands
 in an unintuitive order: the brain thinks, "use ``data`` if possible and use
-``[]`` as a fallback," but the code puts the fallback _before_ the preferred
+``[]`` as a fallback," but the code puts the fallback *before* the preferred
 value.
 
 The author of this package could have written it like this instead::
@@ -129,7 +129,7 @@ chaining::
     >>> title = user_title ?? local_default_title ?? global_default_title
     'Global Default Title'
 
-The direction of associativity is important because the ``None`` coalesing
+The direction of associativity is important because the ``None`` coalescing
 operator short circuits: if its left operand is non-null, then the right
 operand is not evaluated.
 
@@ -143,6 +143,8 @@ operand is not evaluated.
 Null-Aware Member Access Operator
 ---------------------------------
 
+::
+
     >>> title = 'My Title'
     >>> title.upper()
     'MY TITLE'
@@ -158,6 +160,8 @@ Null-Aware Member Access Operator
 Null-Aware Index Access Operator
 ---------------------------------
 
+::
+
     >>> person = {'name': 'Mark', 'age': 32}
     >>> person['name']
     'Mark'