Update and polish Build/Release instructions [BATCH-2222]

[spring-projects-issues]

Gunnar Hillert opened BATCH-2222 and commented

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This issue is a sub-task of BATCH-2217

[spring-projects-issues]

Mahmoud Ben Hassine commented

The release process has been documented in the wiki here: https://github.com/spring-projects/spring-batch/wiki/Release-process (in the same spirit of Spring Framework and Spring Boot).