Fix a small typo (#2253)

Summary: Pull Request resolved: #2253

Differential Revision: D54523664

Author: Olivia-liu

docs/source/runtime-build-and-cross-compilation.md

@@ -140,7 +140,7 @@ Assuming Android NDK is available, run:
 rm -rf cmake-android-out && mkdir cmake-android-out && cd cmake-android-out
 
 # point -DCMAKE_TOOLCHAIN_FILE to the location where ndk is installed
-# Run `which buck2`, if it returns empty (meaning the system doesn't know where buck2 is installed), pass in pass in this flag `-DBUCK2=/path/to/buck2` pointing to buck2
+# Run `which buck2`, if it returns empty (meaning the system doesn't know where buck2 is installed), pass in this flag `-DBUCK2=/path/to/buck2` pointing to buck2
 cmake -DCMAKE_TOOLCHAIN_FILE=/Users/{user_name}/Library/Android/sdk/ndk/25.2.9519653/build/cmake/android.toolchain.cmake  -DANDROID_ABI=arm64-v8a ..
 
 cd  ..