Update documents (#669)

Update CI rules to improve CI build speed, update document about arch support and update document of wamrc help.

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>

.github/workflows/android.yml

@@ -1,6 +1,6 @@
 # This is a basic workflow to help you get started with Actions
 
-name: android
+name: Android
 
 # Controls when the action will run. 
 on:
@@ -31,61 +31,61 @@ jobs:
           cd product-mini/platforms/android
           mkdir build && cd build
           cmake ..
-          make
+          make -j $(nproc)
           cd .. && rm -rf build
       - name: Build iwasm [Classic interp]
         run: |
           cd product-mini/platforms/android
           mkdir build && cd build
           cmake .. -DWAMR_BUILD_FAST_INTERP=0
-          make
+          make -j $(nproc)
           cd .. && rm -rf build
       - name: Build iwasm [Multi module]
         run: |
           cd product-mini/platforms/android
           mkdir build && cd build
           cmake .. -DWAMR_BUILD_MULTI_MODULE=1
-          make
+          make -j $(nproc)
           cd .. && rm -rf build
       - name: Build iwasm [lib-pthread]
         run: |
           cd product-mini/platforms/android
           mkdir build && cd build
           cmake .. -DWAMR_BUILD_LIB_PTHREAD=1
-          make
+          make -j $(nproc)
           cd .. && rm -rf build
       - name: Build iwasm [aot only]
         run: |
           cd product-mini/platforms/android
           mkdir build && cd build
           cmake .. -DWAMR_BUILD_AOT=1 -DWAMR_BUILD_INTERP=0
-          make
+          make -j $(nproc)
           cd .. && rm -rf build
       - name: Build iwasm [interp only]
         run: |
           cd product-mini/platforms/android
           mkdir build && cd build
           cmake .. -DWAMR_BUILD_AOT=0
-          make
+          make -j $(nproc)
           cd .. && rm -rf build
       - name: Build iwasm [memory profiling]
         run: |
           cd product-mini/platforms/android
           mkdir build && cd build
           cmake .. -DWAMR_BUILD_MEMORY_PROFILING=1
-          make
+          make -j $(nproc)
           cd .. && rm -rf build
       - name: Build iwasm [tail call]
         run: |
           cd product-mini/platforms/android
           mkdir build && cd build
           cmake .. -DWAMR_BUILD_TAIL_CALL=1
-          make
+          make -j $(nproc)
           cd .. && rm -rf build
       - name: Build iwasm [custom name section]
         run: |
           cd product-mini/platforms/android
           mkdir build && cd build
           cmake .. -DWAMR_BUILD_CUSTOM_NAME_SECTION=1
-          make
+          make -j $(nproc)
           cd .. && rm -rf build