fix(table): 修复部分由于场景下width未生效导致的一些问题

[Alex-huxiyang]

1. 规范、修正demos
2. 修复由于table的cell部分情况下width属性不生效导致的各种不符合预期的bug

🤔 这个变动的性质是？

• [x] 日常 bug 修复
• [x] 站点、文档改进
• [x] 演示代码改进

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.81%. Comparing base (071f875) to head (dfbc948).

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #2241      +/-   ##
==========================================
- Coverage   85.84%   85.81%   -0.03%     
==========================================
  Files         217      217              
  Lines       22830    22830              
  Branches     2480     2477       -3     
==========================================
- Hits        19598    19592       -6     
- Misses       3227     3233       +6     
  Partials        5        5              

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[eiinu]

@nutui/nutui-react 的 demo 没有生效