Proofread ALTER SEQUENCE grammar + add test cases

[everly-gif]

Ref #17848 .
Sub-issue of #14015

Changes proposed in this pull request:

• Proofread ALTER SEQUENCEgrammar
• Add Tests

[codecov-commenter]

Codecov Report

Merging #19291 (8477d5d) into master (04cbfa2) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #19291      +/-   ##
============================================
- Coverage     59.50%   59.50%   -0.01%     
  Complexity     2371     2371              
============================================
  Files          3817     3817              
  Lines         54327    54327              
  Branches       9244     9244              
============================================
- Hits          32329    32326       -3     
- Misses        19242    19245       +3     
  Partials       2756     2756              

Impacted Files	Coverage Δ
...nd/text/distsql/ral/hint/enums/HintSourceType.java	0.00% <0.00%> (-42.86%)	⬇️

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[strongduanmu]

@everly-gif Looks great, merged.