docs: Fix the build badge for ReadTheDocs.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>

README.rst

diff --git a/README.rst b/README.rst
index 79297df..cfc25bc 100644
--- a/README.rst
+++ b/README.rst
@@ -9,7 +9,7 @@
    :alt: Travis Badge - https://travis-ci.org/google/skywater-pdk
    :target: https://travis-ci.org/google/skywater-pdk
 
-.. image:: https://readthedocs.org/projects/pip/badge/?version=latest&style=flat
+.. image:: https://readthedocs.org/projects/skywater-pdk/badge/?version=latest&style=flat
    :alt: ReadTheDocs Badge - https://skywater-pdk.rtfd.io
    :target: https://skywater-pdk.rtfd.io
 

README.src.rst

diff --git a/README.src.rst b/README.src.rst
index bdcdd1a..3a53a4a 100644
--- a/README.src.rst
+++ b/README.src.rst
@@ -9,7 +9,7 @@
    :alt: Travis Badge - https://travis-ci.org/google/skywater-pdk
    :target: https://travis-ci.org/google/skywater-pdk
 
-.. image:: https://readthedocs.org/projects/pip/badge/?version=latest&style=flat
+.. image:: https://readthedocs.org/projects/skywater-pdk/badge/?version=latest&style=flat
    :alt: ReadTheDocs Badge - https://skywater-pdk.rtfd.io
    :target: https://skywater-pdk.rtfd.io