Fix clippy::doc_markdown lints

.clippy.toml

@@ -0,0 +1,2 @@
+# Don't warn about these identifiers when using clippy::doc_markdown.
+doc-valid-idents = ["ClearType", "HarfBuzz", "OpenType", "PostScript", ".."]

src/internal/aat.rs

@@ -8,7 +8,7 @@ pub const KERX: RawTag = raw_tag(b"kerx");
 pub const ANKR: RawTag = raw_tag(b"ankr");
 pub const KERN: RawTag = raw_tag(b"kern");
 
-/// Maximum number of times we allow consecutive DONT_ADVANCE states.
+/// Maximum number of times we allow consecutive `DONT_ADVANCE` states.
 const MAX_CYCLES: u16 = 16;
 
 /// Gets a value from a lookup table.

src/internal/parse.rs

@@ -274,7 +274,7 @@ impl<'a> Stream<'a> {
 }
 
 /// An array wrapping a byte buffer over a sequence of values that implement
-/// FromBeData.
+/// [`FromBeData`].
 #[derive(Copy, Clone)]
 pub struct Array<'a, T: FromBeData> {
     data: &'a [u8],