Adding pc sampling how to guide (#160)

* Adding pc sampling how to guide

* doc update

* Fixing indentation

* updating index

* udpating doc

* updating doc

* Added field information

* Fixing Formatting

* fix formatting error

* Added json format for pc sampling

* feedback resolved

* formatting for text

* PC Sampling API doc

* Reformatted

* Note for shared systems

* update docs

* correcting relative path for cross-referencing

---------

Co-authored-by: vlaindic_amdeng <vladimir.indic@amd.com>

source/docs/_toc.yml.in

@@ -14,6 +14,7 @@ subtrees:
     - file: how-to/using-rocprofv3
     - file: how-to/using-rocprofiler-sdk-roctx
     - file: how-to/samples
+    - file: how-to/using-pc-sampling
     - file: how-to/using-rocprofv3-with-mpi
   - caption: API reference
     entries: