DOC: use anchor ref in what's new for excel style
see #16062
Thanks! # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16068?src=pr&el=h1) Report
> Merging [#16068](https://codecov.io/gh/pandas-dev/pandas/pull/16068?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/b17e28638995bbfc32bc3dd7c53cd8a343191e58?src=pr&el=desc) will **decrease** coverage by `0.02%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16068/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/16068?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #16068      +/-   ##
==========================================
- Coverage   90.84%   90.82%   -0.03%     
==========================================
  Files         159      159              
  Lines       50791    50791              
==========================================
- Hits        46143    46132      -11     
- Misses       4648     4659      +11
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.6% <ø> (-0.03%)` | :arrow_down: |
| #single | `40.36% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16068?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/plotting/\_converter.py](https://codecov.io/gh/pandas-dev/pandas/pull/16068?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19jb252ZXJ0ZXIucHk=) | `63.54% <0%> (-1.82%)` | :arrow_down: |
| [pandas/core/common.py](https://codecov.io/gh/pandas-dev/pandas/pull/16068?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tbW9uLnB5) | `91.03% <0%> (+0.34%)` | :arrow_up: |

------

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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
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