[PATCH v2] docs: trace: Refactor index documentation

[Purva Yeshi <purvayeshi550@gmail.com>]

Refactored Documentation/trace/index.rst to improve clarity, structure, 
and organization. Reformatted sections, added appropriate headings.

Background of Patch:
This patch is inspired by the maintainer's suggestion on the v1 patch to
bring the documentation into real order, similar to commit '270beb5b2aae'
from Linux 6.13, improving clarity, structure, and usability.

Signed-off-by: Purva Yeshi <purvayeshi550@gmail.com>
---
V1 - https://lore.kernel.org/all/20250204133616.27694-1-purvayeshi550@gmail.com/
V2 - Refined formatting and improved section organization.

 Documentation/trace/index.rst | 86 ++++++++++++++++++++++++++++++-----
 1 file changed, 75 insertions(+), 11 deletions(-)

diff --git a/Documentation/trace/index.rst b/Documentation/trace/index.rst
index 2c991dc96..c4ff7e7de 100644
--- a/Documentation/trace/index.rst
+++ b/Documentation/trace/index.rst
@@ -1,39 +1,103 @@
-==========================
-Linux Tracing Technologies
-==========================
+================================
+Linux Tracing Technologies Guide
+================================
+
+Tracing in the Linux kernel is a powerful mechanism that allows
+developers and system administrators to analyze and debug system
+behavior. This guide provides documentation on various tracing
+frameworks and tools available in the Linux kernel.
+
+Introduction to Tracing
+-----------------------
+
+This section provides an overview of Linux tracing mechanisms
+and debugging approaches.
 
 .. toctree::
-   :maxdepth: 2
+   :maxdepth: 1
 
-   ftrace-design
+   debugging
+   tracepoints
    tracepoint-analysis
+
+Core Tracing Frameworks
+-----------------------
+
+The following are the primary tracing frameworks integrated into
+the Linux kernel.
+
+.. toctree::
+   :maxdepth: 1
+
    ftrace
+   ftrace-design
    ftrace-uses
-   fprobe
    kprobes
    kprobetrace
    uprobetracer
    fprobetrace
-   tracepoints
+   fprobe
+
+Event Tracing and Analysis
+--------------------------
+
+A detailed explanation of event tracing mechanisms and their
+applications.
+
+.. toctree::
+   :maxdepth: 1
+
    events
    events-kmem
    events-power
    events-nmi
    events-msr
-   mmiotrace
+   boottime-trace
    histogram
    histogram-design
-   boottime-trace
-   debugging
    hwlat_detector
    osnoise-tracer
    timerlat-tracer
+
+Hardware and Performance Tracing
+--------------------------------
+
+This section covers tracing features that monitor hardware
+interactions and system performance.
+
+.. toctree::
+   :maxdepth: 1
+
    intel_th
    ring-buffer-design
    ring-buffer-map
    stm
    sys-t
    coresight/index
-   user_events
    rv/index
    hisi-ptt
+
+User-space Tracing
+------------------
+
+These tools allow tracing user-space applications and
+interactions.
+
+.. toctree::
+   :maxdepth: 1
+
+   user_events
+   mmiotrace
+
+Additional Resources
+--------------------
+
+For more details, refer to the respective documentation of each
+tracing tool and framework.
+
+.. only:: subproject and html
+
+   Indices
+   =======
+
+   * :ref:`genindex`
\ No newline at end of file
-- 
2.34.1