Update Pi OS naming.

Rename Debian to Raspberry Pi OS.

docs/source/PCs/Pi/Software/AIO156StartGuide.rst

@@ -1,11 +1,11 @@
 .. include:: /PCs/Shared/pdf_options_software
 
-.. |systemType| replace:: Debian
+.. |systemType| replace:: Raspberry Pi OS
 .. |chip| replace:: AIO CM4
 
 
-AIO-CM4-156 Debian Start Guide
-##############################
+AIO-CM4-156 Raspberry Pi OS Start Guide
+#######################################
 
 .. centered:: Setting up your AIO-CM4-156
 

docs/source/PCs/Pi/Software/Debian.rst

@@ -1,6 +1,6 @@
 .. include:: /PCs/Shared/pdf_options_software
 
-.. |systemType| replace:: Debian 10 (buster) / Debian 11 (bullseye)
+.. |systemType| replace:: Raspberry Pi
 .. |chip| replace:: CM4
 
 
@@ -16,7 +16,7 @@
 .. image:: /Media/Chipsee_Logo_Full.png
    :align: center
 
-This manual provides users with a fast guide of Chipsee Raspberry Pi Computer (Abbreviated as RPC) running a |systemType| OS. Through this manual, users can quickly understand the hardware resources; users can debug |systemType| OS via serial, SSH, and VNC.
+This manual provides users with a quick start guide of Chipsee Raspberry Pi Computer (Abbreviated as RPC) running a |systemType| OS (raspios-debian-buster, raspios-debian-bullseye). Through this manual, users can quickly understand the hardware resources; users can debug |systemType| OS via serial, SSH, and VNC.
 
 .. table::
    :align: center

docs/source/PCs/Pi/Software/index.rst

@@ -13,9 +13,9 @@ If you have questions not covered in this documentation, please consult Chipsee
    :maxdepth: 1
    :titlesonly:
 
-   Debian <Debian>
+   Raspberry Pi OS <Debian>
 
-   AIO-CM4-156 Debian Start Guide <AIO156StartGuide>
+   AIO-CM4-156 Raspberry Pi OS Start Guide <AIO156StartGuide>
 
    AIO-CM4-156 Android Start Guide <AIO156AndroidSystem>