Filter the Markdown support URL.
easy_markdown_support_url
easy_markdown_support_url-
filter -
filter subscribe_field_idFilter the subscription form’s ID prefix.
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filter jetpack_auto_fill_logged_in_userAllow third-party tools to prefill the contact form with the user’s details when they’re logged in.
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filter jetpack_comment_cookie_domainFilter the Jetpack Comment cookie domain.
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filter jetpack_comment_cookie_pathFilter the Jetpack Comment cookie path.
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filter comment_cookie_lifetimeThis filter is already documented in core/wp-includes/comment-functions.php
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filter jetpack_comment_subscription_formFilter the output of the subscription options appearing below the comment form.
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filter jetpack_subscribe_blog_labelFilter the Subscribe to blog text appearing below the comment form.
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filter jetpack_subscribe_comment_labelFilter the Subscribe to comments text appearing below the comment form.
Jetpack Developer Resources 