DOC: Only use ~ in class links to hide prefixes.
This is ported from https://github.com/python-sprints/python-sprints.github.io/pull/78/, as suggested in a comment.

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20402?src=pr&el=h1) Report
> Merging [#20402](https://codecov.io/gh/pandas-dev/pandas/pull/20402?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/aaa4d9092ae83b4c8d92a8910d165237f989b0ca?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/20402/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/20402?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #20402   +/-   ##
=======================================
  Coverage    91.8%    91.8%           
=======================================
  Files         152      152           
  Lines       49205    49205           
=======================================
  Hits        45171    45171           
  Misses       4034     4034
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.18% <ø> (ø)` | :arrow_up: |
| #single | `41.85% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20402?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20402?src=pr&el=footer). Last update [aaa4d90...1dd2752](https://codecov.io/gh/pandas-dev/pandas/pull/20402?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 lgtm. @jorisvandenbossche  @dukebody Thanks!