The docs for is_page_template should clarify it is expecting a filename

[mkaz]

The function is_page_template() accepts a filename as a parameter, this is not the same thing as the template name which is what the inline docs refer to. The template name is specified in the header of the template for example:

page-cool.php

/**
  * Template name: My Cool Template
  */

The parameter should be page-cool.php and not My Cool Template

[mkaz]

Diff to fix 49362, adds "filename" to inline docs instead of just "name"

[SergeyBiryukov]

In 47182:

Docs: Clarify that is_page_template() accepts a template filename, not the Template Name file header.

Props mkaz.
Fixes #49362.