Fix the return docs for `WP_Embed->maybe_make_link()`.

See #30224.

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In `WP_HTTP_IXR_Client`:
* declare `$scheme` as a property, it doesn't exist on the parent class
* declare `$error` as a property of type `IXR_Error`, instead of it being inferred as `boolean` from the parent class

See #30224.

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`WP_Image_Editor_GD` and `WP_Image_Editor_Imagick` should specify type in a doc block for the `$image` property, instead of inferring `bool` and `null`.

See #30224.

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Almost every method in `wp_xmlrpc_server` can also return `IXR_Error` and should be labeled as such. Rehabilitate some `return` syntax.

See #30224.

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In `WP_Comment_Query`, declare `$query_vars` and `$comments` as properties.

See #30224.

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In `WP_Locale`, declare `$number_format` as a property.

See #30224.

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In `WP_Tax_Query`, declare `$primary_table` and `$primary_id_column` as properties.

See #30224.

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In `wp_audio|video_shortcode()`, make sure that `autoplay` and `loop` are booleans. Passing `'false'` to them will force them to be active, which is bad. 

Fixes #29825.

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In `Custom_Background`, declare `$updated` as a property.

See #30224.

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In `Custom_Image_Header`:

* In `->process_default_headers()`, remove check on non-existent `$headers` property. Introduced in [13403]. 
* Declare `$updated` as a property.

See #30224.

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Correct the return value doc block for `get_theme_support()`.

See #30224.

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Correct type in the doc block for `get_theme_support()`.

See #30224.

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Fill in types for the `@param`s for `wp_comment_reply()`.

See #30224.

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Correct the `@param` type for the `$query` arg for `remove_query_arg()`.

See #30224.

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Fill in the `@param` types for the args in `WP_Text_Diff_Renderer_Table->interleave_changed_lines()`.

See #30224.

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Fill in the `@param` types for the args for `dbDelta()`.

See #30224.

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Fill in the `@param` types for the args for `make_site_theme_from_oldschool()`, which is actually the name of a function?

See #30224.

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Fill in the `@param` types for the args for `make_site_theme_from_default()`.

See #30224.

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Fill in the `@param` types for the args for functions missing them in `wp-admin/includes/template.php`.

See #30224.

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Fill in the `@param` types for the args for functions missing them in `wp-admin/includes/taxonomy.php`.

See #30224.

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