JSDoc type for blocksToMarkdown's mdBlocks

[matysikatwork]

In the blocksToMarkdown definition, the mdBlocks argument JSDoc hint is "Defines max depth of nesting," but I think this is a typo and it should read "Array of markdown blocks" as in toMarkdownString.

* @param {MdBlock[]} mdBlocks - Defines max depth of nesting
to
* @param {MdBlock[]} mdBlocks - Array of markdown blocks