DOC: update the pandas.Series.str.slice_replace docstring
Checklist for the pandas documentation sprint (ignore this if you are doing
an unrelated PR):

- [x] PR title is "DOC: update the <your-function-or-method> docstring"
- [x] The validation script passes: `scripts/validate_docstrings.py <your-function-or-method>`
- [x] The PEP8 style check passes: `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] The html version looks good: `python doc/make.py --single <your-function-or-method>`
- [x] It has been proofread on language by another sprint participant

Please include the output of the validation script below between the "```" ticks:

```
################################################################################
################# Docstring (pandas.Series.str.slice_replace)  #################
################################################################################

Replace a sliced string.

Replace a slice of each string in the Series/Index with another
string.

Parameters
----------
start : int or None
    Left edge index.
stop : int or None
    Right edge index.
repl : str or None
    String for replacement.

Returns
-------
replaced : Series/Index of objects

Examples
--------
>>> s = pd.Series(['This is a Test 1', 'This is a Test 2'])
>>> s
0    This is a Test 1
1    This is a Test 2
dtype: object
>>> s = s.str.slice_replace(8, 14, 'an Example')
>>> s
0    This is an Example 1
1    This is an Example 2
dtype: object

################################################################################
################################## Validation ##################################
################################################################################

Errors found:
	See Also section not found

```