docs(Tab): refine the description of 'props'

[pany-ang]

根据以下 Tabs.tsx 的源码，完善文档对应 ellipsis 和 swipe-threshold 的描述：

    const scrollable = computed(
      () =>
        children.length > +props.swipeThreshold ||
        !props.ellipsis ||
        props.shrink,
    );

根据以下 Badge.tsx 的源码，完善文档对应 badg 的描述：

    const renderContent = () => {
      const { dot, max, content } = props;

      if (!dot && hasContent()) {
        if (slots.content) {
          return slots.content();
        }

        if (isDef(max) && isNumeric(content!) && +content > +max) {
          return `${max}+`;
        }

        return content;
      }
    };

[pany-ang]

有关联的 issue: #12738

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.83%. Comparing base (7898140) to head (60f2f64).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12935      +/-   ##
==========================================
+ Coverage   88.80%   88.83%   +0.02%     
==========================================
  Files         257      257              
  Lines        6977     6977              
  Branches     1718     1718              
==========================================
+ Hits         6196     6198       +2     
+ Misses        439      437       -2     
  Partials      342      342              

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[chenjiahan]

Thanks!