s/asembleDebug/assembleDebug (#4816)

docs/docs/Installing.md

 
 #### 7.1 Build app with gradle command 
 
-**prefered solution** The RNN flavor you would like to build is specified in `app/build.gradle`. Therefore in order to compile only that flavor, instead of building your entire project using `./gradlew assembleDebug`, you should instruct gradle to build the app module: `./gradlew app:asembleDebug`. The easiest way is to add a package.json command to build and install your debug Android APK .
+**prefered solution** The RNN flavor you would like to build is specified in `app/build.gradle`. Therefore in order to compile only that flavor, instead of building your entire project using `./gradlew assembleDebug`, you should instruct gradle to build the app module: `./gradlew app:assembleDebug`. The easiest way is to add a package.json command to build and install your debug Android APK .
 
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 "scripts": {