Documentation Updates (#470)

* Updating installation doc

* updating README

* Addressing Yifan's feedback

* trivial updates

* Added limitation for individual xcc in readme

* Added rocprofv3 page

* README updates

* Updating rocprofv3

* source formatting (clang-format v11) (#538)

Co-authored-by: bgopesh <7112102+bgopesh@users.noreply.github.com>

* Merging documentation team's update

* Update source/docs/installation.md

Co-authored-by: Jonathan R. Madsen <jrmadsen@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: bgopesh <7112102+bgopesh@users.noreply.github.com>
Co-authored-by: Jonathan R. Madsen <jrmadsen@users.noreply.github.com>

source/docs/callback_services.md

@@ -0,0 +1,13 @@
+# Callback Tracing Services
+
+```eval_rst
+.. toctree::
+   :glob:
+   :maxdepth: 4
+```
+
+## Overview
+
+## Code Object Tracing
+
+## HSA API Tracing