Fix indentation issues.

Signed-off-by: Zixuan James Li <[email protected]>

Author: PIG208

peps/pep-0728.rst

@@ -284,17 +284,17 @@ added in a subclass, all of the following conditions should apply:
 
 - If ``__extra__`` is read-only
 
-    - The item can be either required or non-required
+  - The item can be either required or non-required
 
-    - The item's value type is consistent with ``T``
+  - The item's value type is consistent with ``T``
 
 - If ``__extra__`` is not read-only
 
-    - The item is non-required
+  - The item is non-required
 
-    - The item's value type is consistent with ``T``
+  - The item's value type is consistent with ``T``
 
-    - ``T`` is consistent with the item's value type
+  - ``T`` is consistent with the item's value type
 
 - If ``__extra__`` is not redeclared, the subclass inherits it as-is.
 
@@ -335,19 +335,19 @@ infinite set of items that all satisfy the following conditions:
 
 - If ``__extra__`` is read-only
 
-    - The key's value type is consistent with ``T``
+  - The key's value type is consistent with ``T``
 
-    - The key is not in ``S``.
+  - The key is not in ``S``.
 
 - If ``__extra__`` is not read-only
 
-    - The key is non-required
+  - The key is non-required
 
-    - The key's value type is consistent with ``T``
+  - The key's value type is consistent with ``T``
 
-    - ``T`` is consistent with the key's value type
+  - ``T`` is consistent with the key's value type
 
-    - The key is not in ``S``.
+  - The key is not in ``S``.
 
 For type checking purposes, let ``__extra__`` be a non-required pseudo-item to
 be included whenever "for each ... item/key" is stated in
@@ -410,7 +410,7 @@ corresponding key. ``"year"`` being required violates the rule "For each
 required key in ``B``, the corresponding key is required in ``A``".
 
 When ``__extra__`` is defined to be read-only in a TypedDict type, it is possible 
-for an item to have a narrower type than ``__extra__``'s value type.
+for an item to have a narrower type than ``__extra__``'s value type::
 
     class Movie(TypedDict):
         name: str
@@ -448,7 +448,7 @@ Interaction with Mapping[KT, VT]
 A TypedDict type can be consistent with ``Mapping[KT, VT]`` types other than
 ``Mapping[str, object]`` as long as the union of value types on the TypedDict
 type is consistent with ``VT``. It is an extension of this rule from the typing
-spec::
+spec:
 
     * A TypedDict with all ``int`` values is not consistent with
       ``Mapping[str, int]``, since there may be additional non-``int``