Update NDK version to r26d in docs (#5612)

Summary: Pull Request resolved: pytorch/executorch#5612

Reviewed By: cmodi-meta, cccclai

Differential Revision: D63353031

Pulled By: kirklandsign

fbshipit-source-id: 0baef63226c8606e2e263a73adde6ac01f2db808

Author: kirklandsign

backends/vulkan/README.md

@@ -137,12 +137,12 @@ compile the Vulkan Compute Library's GLSL compute shaders.
 The Vulkan Delegate libraries can be built by setting `-DEXECUTORCH_BUILD_VULKAN=ON`
 when building with CMake.
 
-First, make sure that you have the Android NDK installed - Android NDK r25c is
+First, make sure that you have the Android NDK installed - Android NDK 26.3.11579264 is
 recommended. The Android SDK should also be installed so that you have access
 to `adb`.
 
 ```shell
-# Recommended version is Android NDK r25c.
+# Recommended version is Android NDK 26.3.11579264.
 export ANDROID_NDK=<path_to_ndk>
 # Select an appropriate Android ABI
 export ANDROID_ABI=arm64-v8a

backends/vulkan/docs/android_demo.md

@@ -28,7 +28,7 @@ Tutorial in order to install the specified versions of the Android NDK and the
 Android SDK.
 
 ```shell
-# Recommended version is Android NDK r25c.
+# Recommended version is Android NDK 26.3.11579264.
 export ANDROID_NDK=<path_to_ndk>
 # Select an appropriate Android ABI
 export ANDROID_ABI=arm64-v8a

examples/demo-apps/android/LlamaDemo/SDK-quick-setup-guide.md

@@ -70,9 +70,9 @@ export ANDROID_HOME="$(realpath $DEV_HOME/sdk)"
 # Install SDK 34
 ./cmdline-tools/bin/sdkmanager --sdk_root="${ANDROID_HOME}" --install "platforms;android-34"
 # Install NDK
-./cmdline-tools/bin/sdkmanager --sdk_root="${ANDROID_HOME}" --install "ndk;25.0.8775105"
+./cmdline-tools/bin/sdkmanager --sdk_root="${ANDROID_HOME}" --install "ndk;26.3.11579264"
 # The NDK root is then under `ndk/<version>`.
-export ANDROID_NDK="$ANDROID_HOME/ndk/25.0.8775105"
+export ANDROID_NDK="$ANDROID_HOME/ndk/26.3.11579264"
 ```
 
 ### (Optional) Android Studio Setup

examples/demo-apps/android/LlamaDemo/docs/delegates/mediatek_README.md

@@ -5,7 +5,7 @@ More specifically, it covers:
 2. Building and linking libraries that are required to inference on-device for Android platform using MediaTek AI accelerators.
 3. Loading the needed files on the device and running inference.
 
-Verified on MacOS, Linux CentOS (model export), Python 3.10, Android NDK 25.0.8775105
+Verified on MacOS, Linux CentOS (model export), Python 3.10, Android NDK 26.3.11579264
 Phone verified: MediaTek Dimensity 9300 (D9300) chip.
 
 ## Prerequisites

examples/demo-apps/android/LlamaDemo/docs/delegates/xnnpack_README.md

@@ -14,15 +14,15 @@ Phone verified: OnePlus 12. Samsung S23 (Llama only), Samsung S24+ (Llama only),
 
 ## Prerequisites
 * Install [Java 17 JDK](https://www.oracle.com/java/technologies/javase/jdk17-archive-downloads.html).
-* Install the [Android SDK API Level 34](https://developer.android.com/about/versions/14/setup-sdk) and [Android NDK 25.0.8775105](https://developer.android.com/studio/projects/install-ndk).
+* Install the [Android SDK API Level 34](https://developer.android.com/about/versions/15/setup-sdk) and [Android NDK 26.3.11579264](https://developer.android.com/studio/projects/install-ndk).
 * If you have Android Studio set up, you can install them with
   * Android Studio Settings -> Language & Frameworks -> Android SDK -> SDK Platforms -> Check the row with API Level 34.
   * Android Studio Settings -> Language & Frameworks -> Android SDK -> SDK Tools -> Check NDK (Side by side) row.
 * Alternatively, you can follow [this guide](https://github.com/pytorch/executorch/blob/856e085b9344c8b0bf220a97976140a5b76356aa/examples/demo-apps/android/LlamaDemo/SDK.md) to set up Java/SDK/NDK with CLI.
 Supported Host OS: CentOS, macOS Sonoma on Apple Silicon.
 
 
-Note: This demo app and tutorial has only been validated with arm64-v8a [ABI](https://developer.android.com/ndk/guides/abis), with NDK 25.0.8775105.
+Note: This demo app and tutorial has only been validated with arm64-v8a [ABI](https://developer.android.com/ndk/guides/abis), with NDK 26.3.11579264.