Some examples have reference to wrong gradle-7.1.1-bin.zip file

[Peter Kester]

Some of the examples have a gradle wrapper properties file that points to a non existing distributionUrl.

distributionUrl=https\://services.gradle.org/distributions/gradle-7.1.1bin.zip

should be

distributionUrl=https\://services.gradle.org/distributions/gradle-7.1.1-bin.zip

[Rob Rudin]

Closed via #618