clippy: Fix doc_markdown warnings.

src/com.rs

@@ -64,7 +64,7 @@ where
     fn as_unknown(&self) -> &IUnknown {
         unsafe { &*(self.0 as *mut IUnknown) }
     }
-    /// Performs QueryInterface fun.
+    /// Performs `QueryInterface` fun.
     pub fn cast<U>(&self) -> Result<ComPtr<U>, i32>
     where
         U: Interface,

src/lib.rs

@@ -693,7 +693,7 @@ impl Build {
     /// `true`.
     ///
     /// The name of the C++ standard library to link is decided by:
-    /// 1. If [cpp_link_stdlib](Build::cpp_link_stdlib) is set, use its value.
+    /// 1. If [`cpp_link_stdlib`](Build::cpp_link_stdlib) is set, use its value.
     /// 2. Else if the `CXXSTDLIB` environment variable is set, use its value.
     /// 3. Else the default is `libc++` for OS X and BSDs, `libc++_shared` for Android,
     /// `None` for MSVC and `libstdc++` for anything else.
@@ -708,7 +708,7 @@ impl Build {
     /// the most common compiler flags, e.g. `-std=c++17`, some project-specific
     /// flags might have to be prefixed with "-Xcompiler" flag, for example as
     /// `.flag("-Xcompiler").flag("-fpermissive")`. See the documentation for
-    /// `nvcc`, the CUDA compiler driver, at https://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/
+    /// `nvcc`, the CUDA compiler driver, at <https://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/>
     /// for more information.
     ///
     /// If enabled, this also implicitly enables C++ support.
@@ -1044,7 +1044,7 @@ impl Build {
     /// Adds a native library modifier that will be added to the
     /// `rustc-link-lib=static:MODIFIERS=LIBRARY_NAME` metadata line
     /// emitted for cargo if `cargo_metadata` is enabled.
-    /// See https://doc.rust-lang.org/rustc/command-line-arguments.html#-l-link-the-generated-crate-to-a-native-library
+    /// See <https://doc.rust-lang.org/rustc/command-line-arguments.html#-l-link-the-generated-crate-to-a-native-library>
     /// for the list of modifiers accepted by rustc.
     pub fn link_lib_modifier(&mut self, link_lib_modifier: &str) -> &mut Build {
         self.link_lib_modifiers.push(link_lib_modifier.into());
@@ -1599,7 +1599,8 @@ impl Build {
 
     /// Get the compiler that's in use for this configuration.
     ///
-    /// This will return a result instead of panicing; see get_compiler() for the complete description.
+    /// This will return a result instead of panicing; see
+    /// [`get_compiler()`](Self::get_compiler) for the complete description.
     pub fn try_get_compiler(&self) -> Result<Tool, Error> {
         let opt_level = self.get_opt_level()?;
         let target = self.get_target()?;
@@ -2797,7 +2798,7 @@ impl Build {
     }
 
     /// Returns the C++ standard library:
-    /// 1. If [cpp_link_stdlib](cc::Build::cpp_link_stdlib) is set, uses its value.
+    /// 1. If [`cpp_link_stdlib`](cc::Build::cpp_link_stdlib) is set, uses its value.
     /// 2. Else if the `CXXSTDLIB` environment variable is set, uses its value.
     /// 3. Else the default is `libc++` for OS X and BSDs, `libc++_shared` for Android,
     /// `None` for MSVC and `libstdc++` for anything else.
@@ -3623,7 +3624,7 @@ impl Tool {
     ///
     /// Nvidia compiler accepts only the most common compiler flags like `-D`,
     /// `-I`, `-c`, etc. Options meant specifically for the underlying
-    /// host C++ compiler have to be prefixed with '-Xcompiler`.
+    /// host C++ compiler have to be prefixed with `-Xcompiler`.
     /// [Another possible future application for this function is passing
     /// clang-specific flags to clang-cl, which otherwise accepts only
     /// MSVC-specific options.]

src/os_pipe.rs

@@ -1,8 +1,8 @@
 //! Adapted from:
-//!  - https://doc.rust-lang.org/src/std/sys/unix/pipe.rs.html
-//!  - https://doc.rust-lang.org/src/std/sys/unix/fd.rs.html#385
-//!  - https://github.com/rust-lang/rust/blob/master/library/std/src/sys/mod.rs#L57
-//!  - https://github.com/oconnor663/os_pipe.rs
+//!  - <https://doc.rust-lang.org/src/std/sys/unix/pipe.rs.html>
+//!  - <https://doc.rust-lang.org/src/std/sys/unix/fd.rs.html#385>
+//!  - <https://github.com/rust-lang/rust/blob/master/library/std/src/sys/mod.rs#L57>
+//!  - <https://github.com/oconnor663/os_pipe.rs>
 use std::fs::File;
 
 /// Open a new pipe and return a pair of [`File`] objects for the reader and writer.

src/os_pipe/windows.rs

@@ -4,7 +4,7 @@ use std::{fs::File, io, os::windows::prelude::*, ptr};
 /// NOTE: These pipes do not support IOCP.
 ///
 /// If IOCP is needed, then you might want to emulate
-/// anonymous pipes with CreateNamedPipe, as Rust's stdlib does.
+/// anonymous pipes with `CreateNamedPipe`, as Rust's stdlib does.
 pub(super) fn pipe() -> io::Result<(File, File)> {
     let mut read_pipe = INVALID_HANDLE_VALUE;
     let mut write_pipe = INVALID_HANDLE_VALUE;

src/winapi.rs

@@ -11,7 +11,7 @@ use std::os::raw;
 
 pub type wchar_t = u16;
 
-pub use crate::windows_sys::{FILETIME, GUID, HRESULT, SAFEARRAY, SAFEARRAYBOUND};
+pub use crate::windows_sys::{FILETIME, GUID, HRESULT, SAFEARRAY};
 
 pub type REFIID = *const IID;
 pub type IID = GUID;