Add required version

Author: romtsn

docs/platforms/android/session-replay/privacy/index.mdx

@@ -22,6 +22,8 @@ options.experimental.sessionReplay.maskAllText = false
 options.experimental.sessionReplay.maskAllImages = false
 ```
 
+_Make sure your Sentry Android SDK version is at least 7.15.0._
+
 ## Mask by View Class
 
 You can choose which type of view you want to mask or unmask by using the `addMaskViewClass` or `addUnmaskViewClass` options.