DOC: Move documentation from 2.0 Notes/migration guide to release fragment

Author: seberg

doc/release/upcoming_changes/26103.c_api.rst

@@ -0,0 +1,15 @@
+API symbols now hidden but customizable
+---------------------------------------
+NumPy now defaults to hide the API symbols it adds to allow all NumPy API
+usage.
+This means that by default you cannot dynamically fetch the NumPy API from
+another library (this was never possible on windows).
+
+If you are experiencing linking errors related to ``PyArray_API`` or
+``PyArray_RUNTIME_VERSION``, you can define the
+:c:macro:`NPY_API_SYMBOL_ATTRIBUTE` to opt-out of this change.
+
+If you are experiencing problems due to an upstream header including NumPy,
+the solution is to make sure you ``#include "numpy/ndarrayobject.h"`` before
+their header and import NumPy yourself based on  :ref:`including-the-c-api`.
+

doc/source/numpy_2_0_migration_guide.rst

@@ -221,21 +221,6 @@ using the NumPy types. You can still write cython code using the ``c.real`` and
 ``c.imag`` attributes (using the native typedefs), but you can no longer use
 in-place operators ``c.imag += 1`` in Cython's c++ mode.
 
-.. _api-table-visibility-change:
-
-Changes in table visibility (linking error)
--------------------------------------------
-If you are experiencing linking errors related to ``PyArray_API`` or
-``PyArray_RUNTIME_VERSION``, NumPy changed the default visibility to hidden
-(which was always the case on windows).
-You can use the :c:macro:`NPY_API_SYMBOL_ATTRIBUTE` to opt-out of this change.
-However, we generally discourage linking across project boundaries because
-it breaks NumPy compatibility checks.
-
-If you are experiencing problems due to an upstream header including NumPy,
-the solution is to make sure you ``#include "numpy/ndarrayobject.h"`` before
-their header and import NumPy yourself based on  :ref:`including-the-c-api`.
-
 
 Changes to namespaces
 =====================

doc/source/release/2.0.0-notes.rst

@@ -655,17 +655,6 @@ Please see :ref:`migration_c_descr` for more information.
 
 (`gh-25943 <https://github.com/numpy/numpy/pull/25943>`__)
 
-API symbols now hidden but customizable
----------------------------------------
-NumPy now defaults to hide the API symbols it adds to allow all NumPy API
-usage.
-This means that by default you cannot dynamically fetch the NumPy API from
-another library (this was never possible on windows).
-Please see :ref:`api-table-visibility-change` and the new
-:c:macro:`NPY_API_SYMBOL_ATTRIBUTE` which allows to customize/revert this.
-
-(`gh-26103 <https://github.com/numpy/numpy/pull/26103>`__)
-
 
 NumPy 2.0 C API removals
 ========================