DOC: read_excel supports skiprows argument like read_csv, but tests and docs needed
#### Location of the documentation

https://pandas.pydata.org/docs/reference/api/pandas.read_excel.html
https://pandas.pydata.org/docs/reference/api/pandas.read_csv.html

#### Documentation problem

In `read_csv`, we say that we support:
**skiprows           list-like, int or callable, optional**

_Line numbers to skip (0-indexed) or number of lines to skip (int) at the start of the file._

_If callable, the callable function will be evaluated against the row indices, returning True
if the row should be skipped and False otherwise. An example of a valid callable argument 
would be lambda x: x in [0, 2]._


In `read_excel`, we say that we support:

**skiprows     list-like**

_Rows to skip at the beginning (0-indexed)._

It turns out that the `int` and `callable` arguments work fine with `read_excel()`, so we should indicate that in the documentation. 
 We also need to add tests for those 2 cases.

#### Suggested fix for documentation and additional tests

- copy the `read_csv` doc for `skiprows` over to `read_excel`
- add tests to `tests/io/excel/test_readers.py` for the `int` and `callable` options