Docs: Fix a typo in the WP_Block_Parser::add_inner_block() DocBlock

[mukeshpanchal27]

Trac ticket: https://core.trac.wordpress.org/ticket/65818

Corrects "continuing form earlier output" to "continuing from earlier output" in the $last_offset parameter description.

Documentation only, no functional change.

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Used for: Drafting the PR, drafting this description. I have reviewed the change and take responsibility for it.

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