SpringBoot Remove unnecessary unit for spring.datasource.tomcat.max-active

There is mistakenly added measure millisecond(ms) for config definition spring.datasource.tomcat.max-active=50. Here 50 should be pure count

Comment From: pivotal-cla

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Comment From: pivotal-cla

@temnur Thank you for signing the Contributor License Agreement!

Comment From: snicoll

@temnur thank you for making your first contribution to Spring Boot.