Fix typo in cross-compiling documentation of iOS and add it to the index.

doc/mobile/cross_compiling_for_ios_cn.md

@@ -18,11 +18,11 @@ PaddlePaddle为交叉编译提供了工具链配置文档[cmake/cross_compiling/
 
 - `CMAKE_SYSTEM_NAME`，CMake编译的目标平台，必须设置为`iOS`。在设置`CMAKE_SYSTEM_NAME=iOS`后，PaddlePaddle的CMake系统会自动编译所有的第三方依赖库，并且强制设置一些PaddlePaddle参数的值（`WITH_C_API=ON`、`WITH_GPU=OFF`、`WITH_AVX=OFF`、`WITH_PYTHON=OFF`、`WITH_RDMA=OFF`）。
 - `WITH_C_API`，是否编译C-API预测库，必须设置为ON。在iOS平台上只支持使用C-API来预测。
-- `WITH_SWIG_PY`，必须设置为ON。在iOS平台上不支持通过swig调用来训练或者预测。
+- `WITH_SWIG_PY`，必须设置为`OFF`。在iOS平台上不支持通过swig调用来训练或者预测。
 
 iOS平台可选配置参数：
 
-- `IOS_PLATFORM`，可设置为`OS/SIMULATOR`，默认值为`OS`。
+- `IOS_PLATFORM`，可设置为`OS`（默认值）或`SIMULATOR`。
   - `OS`，构建目标为`arm`架构的iPhone或者iPad等物理设备。
   - `SIMULATOR`，构建目标为`x86`架构的模拟器平台。
 - `IOS_ARCH`，目标架构。针对不同的`IOS_PLATFORM`，可设置的目标架构如下表所示，默认编译所有架构：

doc/mobile/cross_compiling_for_ios_en.md

@@ -18,12 +18,12 @@ PaddlePaddle provides cross-compiling toolchain configuration documentation [cma
 
 There are some mandatory environment variables need to be set before cross compiling PaddlePaddle for iOS:
 
-- `CMAKE_SYSTEM_NAME`, CMake compiling target platform name, has to be `iOS`. PaddlePaddle CMake will compile all the third party dependencies and enforce some parameters (`WITH_C_API=ON`、`WITH_GPU=OFF`、`WITH_AVX=OFF`、`WITH_PYTHON=OFF`、`WITH_RDMA=OFF`) when this variable is set with value `iOS`.
+- `CMAKE_SYSTEM_NAME`, CMake compiling target platform name, has to be `iOS`. PaddlePaddle CMake will compile all the third party dependencies and enforce some parameters (`WITH_C_API=ON`, `WITH_GPU=OFF`, `WITH_AVX=OFF`, `WITH_PYTHON=OFF`,`WITH_RDMA=OFF`) when this variable is set with value `iOS`.
 
 - `WITH_C_API`, Whether to compile inference C-API library, has to be `ON`, since C-API is the only supported interface for inferencing in iOS.
-- `WITH_SWIG_PY`, has to be `ON`. It's not supported to inference or train via swig in iOS.
+- `WITH_SWIG_PY`, has to be `OFF`. It's not supported to inference or train via swig in iOS.
 
-Optional environment variables for iOS are：
+Optional environment variables for iOS are:
 
 - `IOS_PLATFORM`, either `OS` (default) or `SIMULATOR`.
   - `OS`, build targets ARM-based physical devices like iPhone or iPad.
@@ -115,6 +115,6 @@ Please Note: if you compiled PaddlePaddle in the source directory for other plat
 - `lib`, contains PaddlePaddle C-API static library.
 - `third_party` contains all the 3rd party libraries.
 
-Please note: if PaddlePaddle library need to support both physical devices and simulators, you will need to compile correspondingly, then merge fat library with `lipo`
+Please note: if PaddlePaddle library need to support both physical devices and simulators, you will need to compile correspondingly, then merge fat library with `lipo`.
 
 Now you will have PaddlePaddle library compiled and installed, the fat library can be used in deep learning related iOS APPs. Please refer to C-API documentation for usage guides.

doc/mobile/index_en.rst

@@ -5,4 +5,5 @@ MOBILE
   :maxdepth: 1
 
   cross_compiling_for_android_en.md
+  cross_compiling_for_ios_en.md
   cross_compiling_for_raspberry_en.md