[MINOR] docs: update the document and scripts of build tez.

[zhengchenyu]

update the document and scripts of build tez.

[jerqi]

LGTM, thanks @zhengchenyu

[jerqi]

Could you change
Currently it supports [Apache Spark](https://spark.apache.org/) and [Apache Hadoop MapReduce](https://hadoop.apache.org/) and [Apache Tez](https://tez.apache.org/).
to
Currently it supports [Apache Spark](https://spark.apache.org/), [Apache Hadoop MapReduce](https://hadoop.apache.org/) and [Apache Tez](https://tez.apache.org/). by the way?

[codecov-commenter]

Codecov Report

Merging #997 (b719cd0) into master (1159271) will increase coverage by 1.15%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #997      +/-   ##
============================================
+ Coverage     53.44%   54.60%   +1.15%     
- Complexity     2513     2514       +1     
============================================
  Files           376      356      -20     
  Lines         20521    18161    -2360     
  Branches       1764     1764              
============================================
- Hits          10967     9916    -1051     
+ Misses         8866     7628    -1238     
+ Partials        688      617      -71     

see 23 files with indirect coverage changes

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