[MINOR] docs: update document and build script for Hadoop-3.2

[zhengchenyu]

What changes were proposed in this pull request?

• Update document, including the supported mapReduce version and build command.
• Update build_distribution.sh. We can't recognize the hadoop version from final package name for now. We should update the final package name.

[jerqi]

LGTM, thanks @zhengchenyu

[codecov-commenter]

Codecov Report

Merging #912 (6b2174d) into master (b08efa3) will increase coverage by 1.79%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #912      +/-   ##
============================================
+ Coverage     55.30%   57.09%   +1.79%     
+ Complexity     2202     2201       -1     
============================================
  Files           333      313      -20     
  Lines         16448    14088    -2360     
  Branches       1308     1308              
============================================
- Hits           9097     8044    -1053     
+ Misses         6838     5603    -1235     
+ Partials        513      441      -72     

see 23 files with indirect coverage changes

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