DOC: Fix indentation of a few release notes.

[skip actions] [skip azp] [skip cirrus]

Author: WarrenWeckesser

doc/release/upcoming_changes/26388.performance.rst

@@ -1,3 +1,3 @@
- * `numpy.save` now uses pickle protocol version 4 for saving arrays with
-   object dtype, which allows for pickle objects larger than 4GB and improves
-   saving speed by about 5% for large arrays.
+* `numpy.save` now uses pickle protocol version 4 for saving arrays with
+  object dtype, which allows for pickle objects larger than 4GB and improves
+  saving speed by about 5% for large arrays.

doc/release/upcoming_changes/26452.deprecation.rst

@@ -1,4 +1,4 @@
-  * The `fix_imports` keyword argument in `numpy.save` is deprecated. Since
-    NumPy 1.17, `numpy.save` uses a pickle protocol that no longer supports
-    Python 2, and ignored `fix_imports` keyword. This keyword is kept only
-    for backward compatibility. It is now deprecated.
+* The `fix_imports` keyword argument in `numpy.save` is deprecated. Since
+  NumPy 1.17, `numpy.save` uses a pickle protocol that no longer supports
+  Python 2, and ignored `fix_imports` keyword. This keyword is kept only
+  for backward compatibility. It is now deprecated.

doc/release/upcoming_changes/27076.deprecation.rst

@@ -1,3 +1,3 @@
-  * Passing non-integer inputs as the first argument of `bincount` is now
-    deprecated, because such inputs are silently cast to integers with no
-    warning about loss of precision.
+* Passing non-integer inputs as the first argument of `bincount` is now
+  deprecated, because such inputs are silently cast to integers with no
+  warning about loss of precision.