Block elasticjob-spring-boot-starter from passing spring-boot-starter test scope dependencies

[linghengqian]

Fixes #2418.

Changes proposed in this pull request:

• Block elasticjob-spring-boot-starter from passing spring-boot-starter test scope dependencies.
• Update missing documentation.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.61%. Comparing base (a8ba448) to head (5b406f4).
Report is 35 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2421      +/-   ##
============================================
- Coverage     80.10%   79.61%   -0.50%     
+ Complexity     1113     1106       -7     
============================================
  Files           204      204              
  Lines          3821     3806      -15     
  Branches        445      443       -2     
============================================
- Hits           3061     3030      -31     
- Misses          570      585      +15     
- Partials        190      191       +1     

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