multi-byte utf-8 characters in doc comments break docify

[sam0x17]

Code sample:

/// Example struct holding the most recently set [`u32`] and the second
/// most recently set [`u32`] (if one existed).
pub struct Foo;

Fixes when word wrapping is tweaked to:

/// Example struct holding the most recently set [`u32`] and the
/// second most recently set [`u32`] (if one existed).
pub struct Foo;

cc @liamaharon

[sam0x17]

This regex change fixes it this regex change fixes the initial issue:

-static DOC_COMMENT_ATTR: Lazy<Regex> = Lazy::new(|| Regex::new(r#"#\[doc = ".*"]"#).unwrap());
+static DOC_COMMENT_ATTR: Lazy<Regex> =
+    Lazy::new(|| Regex::new(r#"#\[doc\s*=\s*".*"\s*]"#).unwrap());

[sam0x17]

Re-opening because the real reason this is happening is the presence of special characters in doc comments in the file. The following being present anywhere in the source file being embedded will reproduce the bug:

//! ```text
//! ├
//! ```

[sam0x17]

ah and the reason this is an issue is multi-byte UTF-8 characters

[sam0x17]

fixed in v0.2.3