Several typo corrections in po.php file

[shailu25]

Several typo corrections in inline documents in wp-includes/pomo/po.php

1. Line no 56

@return string sequence of mgsgid/msgstr PO strings, doesn't containt newline at the end

it Should be

@return string sequence of msgid/msgstr PO strings, doesn't contain a newline at the end

2. Line no 67

enrtries

It should be

entries

3. Line no 130

readbility

It Should be

readability

4. Line no 144

enascaped

It should be

escaped

[shailu25]

Patch Added

[SergeyBiryukov]

In 57356:

Docs: Fix a few typos in wp-includes/pomo/po.php.

Props shailu25.
Fixes #60346.