DOC: Fix invalid URL in the index.rst file. (numpy#27920)

* Modify the invalid URL in the index.rst file.

* Modify the index.rst format to enhance readability.

* Modify the index.rst format to enhance readability.

* Modify the index.rst format to enhance readability.

* Modify the index.rst format to enhance readability.

* MAINT: Rephrase a bit.

---------

Co-authored-by: Charles Harris <[email protected]>

Author: setbit123

doc/neps/index.rst

@@ -5,8 +5,9 @@ Roadmap & NumPy enhancement proposals
 This page provides an overview of development priorities for NumPy.
 Specifically, it contains a roadmap with a higher-level overview, as
 well as NumPy Enhancement Proposals (NEPs)—suggested changes
-to the library—in various stages of discussion or completion (see `NEP
-0 <nep-0000>`__).
+to the library—in various stages of discussion or completion.
+See `NEP 0 <https://github.com/numpy/numpy/blob/main/doc/neps/nep-0000.rst>`__
+for more informations about NEPs.
 
 Roadmap
 -------