Use the placeholder in doc for artifact version

[awxiaoxian2020]

In our doc, we use mybatis-x.x.x.jar for the current version, I found in Mybatis-Spring, it fixed by ${project.version}, I'm not familiar with maven this feature. It doesn't work when I replaced with it. Need help.

[awxiaoxian2020]

See mybatis/spring-boot-starter#515 and mybatis/spring-boot-starter#516

[hazendaz]

@awxiaoxian2020 Its using maven filtering which replaces entries in documentation with maven properties. See https://maven.apache.org/plugins/maven-resources-plugin/examples/filter.html

[awxiaoxian2020]

@awxiaoxian2020 Its using maven filtering which replaces entries in documentation with maven properties. See https://maven.apache.org/plugins/maven-resources-plugin/examples/filter.html

I tried it and failed. It doesn't work for my config. Could you please make a PR if you are available？