Update JSXV4.md

Author: cristianoc

res_syntax/cli/JSXV4.md

@@ -18,7 +18,7 @@ To build an entire project in V4 mode, including all its dependencies, use the n
 ### Dependency-level config
 
 Dependencies inherit the `jsx` configuration of the root project. So if the root project uses V4 then the dependencies are built using V4, and the same for V3.
-To build certain dependencies in V3 compatibility mode, whatever the version used in the root project, use `"v3-dependencies"`: the listed dependencies will be built in V3 mode, and in addition `-open ReatcV3` is added to the compiler options.
+To build certain dependencies in V3 compatibility mode, whatever the version used in the root project, use `"v3-dependencies"`: the listed dependencies will be built in V3 mode, and in addition `-open ReactV3` is added to the compiler options.
 
 For example, suppose a V3 project uses rescript-react 0.11, which requires compatibility mode if compiled with V3, and that 2 dependencies `"rescript-react-native", "rescript-react-navigation"` only build with compatibility mode. Then the setting will be: