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/buffered_services.md

@@ -0,0 +1,19 @@
+# Buffered Services
+
+For the buffered approach, supported buffer record categories are enumerated in `rocprofiler_buffer_category_t` category field.
+
+## Buffered Tracing Services
+
+```eval_rst
+.. toctree::
+   :glob:
+   :maxdepth: 4
+```
+
+## Overview
+
+In buffered approach, callbacks are receieved for batches of records from an internal (background) thread. Supported buffered tracing services are enumerated in  `rocprofiler_buffer_tracing_kind_t`.
+
+## HSA API Tracing
+
+## Kernel Tracing