Add RaspberryPi Tutorials to deploy & infer llama model (#15109)

### Summary
[PLEASE REMOVE] See [CONTRIBUTING.md's Pull
Requests](https://github.com/pytorch/executorch/blob/main/CONTRIBUTING.md#pull-requests)
for ExecuTorch PR guidelines.

[PLEASE REMOVE] If this PR closes an issue, please add a `Fixes
#<issue-id>` line.

[PLEASE REMOVE] If this PR introduces a fix or feature that should be
the upcoming release notes, please add a "Release notes: <area>" label.
For a list of available release notes labels, check out
[CONTRIBUTING.md's Pull
Requests](https://github.com/pytorch/executorch/blob/main/CONTRIBUTING.md#pull-requests).

### Test plan
[PLEASE REMOVE] How did you test this PR? Please write down any manual
commands you used and note down tests that you have written if
applicable.

Author: psiddh

docs/source/desktop-section.md

@@ -12,8 +12,13 @@ Deploy ExecuTorch on Linux, macOS, and Windows with optimized backends for each
 
 - {doc}`desktop-backends` — Available desktop backends and platform-specific optimization
 
+## Tutorials
+
+- {doc}`raspberry_pi_llama_tutorial` — Cross compiling ExecuTorch for the Raspberry Pi on Linux Host
+
 ```{toctree}
 :hidden:
 using-executorch-cpp
 using-executorch-building-from-source
 desktop-backends
+raspberry_pi_llama_tutorial

docs/source/edge-platforms-section.md

@@ -12,6 +12,7 @@ Deploy ExecuTorch on Android devices with hardware acceleration support.
 **→ {doc}`android-section` — Complete Android deployment guide**
 
 Key features:
+
 - Hardware acceleration support (CPU, GPU, NPU)
 - Multiple backend options (XNNPACK, Vulkan, Qualcomm, MediaTek, ARM, Samsung)
 - Comprehensive examples and demos

docs/source/embedded-section.md

@@ -25,7 +25,7 @@ Start here for C++ development with ExecuTorch runtime APIs and essential tutori
 ## Tutorials
 
 - {doc}`tutorial-arm-ethos-u` — Export a simple PyTorch model for the ExecuTorch Ethos-U backend
-
+- {doc}`raspberry_pi_llama_tutorial` — Deploy a LLaMA model on a Raspberry Pi
 
 ```{toctree}
 :hidden:
@@ -37,3 +37,4 @@ using-executorch-cpp
 using-executorch-building-from-source
 embedded-backends
 tutorial-arm-ethos-u
+raspberry_pi_llama_tutorial