[move] Support parsing doc comments before/after/in-between attributes

[tzakian]

Description

Adds support for parsing doc comments with attributes either before, after, or in the middle of the doc comments.

Before, the following were all errors

/// Doc comment
#[annotation]
fun foo() { }

/// Doc comment
#[annotation]
/// Other doc comment
fun foo() { }

/// Doc comment
#[annotation]
/// Other doc comment
#[annotation]
fun foo() { }

These are now all supported, and the previous behavior of

#[annotation]
/// Doc comments
fun foo() { }

is also maintained.

Test plan

Added additional tests for both the parser, and docgen to make sure we attach doc comments correctly.

[vercel[bot]]

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