Convert html links to intra-doc links

src/error.rs

@@ -490,7 +490,7 @@ impl Error {
     /// context has been attached. For details about the interaction between
     /// context and downcasting, [see here].
     ///
-    /// [see here]: trait.Context.html#effect-on-downcasting
+    /// [see here]: crate::Context#effect-on-downcasting
     pub fn is<E>(&self) -> bool
     where
         E: Display + Debug + Send + Sync + 'static,

src/lib.rs

@@ -139,7 +139,7 @@
 //!   - If you want only panics to have backtraces, set `RUST_BACKTRACE=1` and
 //!     `RUST_LIB_BACKTRACE=0`.
 //!
-//!   [`std::backtrace`]: https://doc.rust-lang.org/std/backtrace/index.html#environment-variables
+//!   [`std::backtrace`]: std::backtrace#environment-variables
 //!
 //! - Anyhow works with any error type that has an impl of `std::error::Error`,
 //!   including ones defined in your crate. We do not bundle a `derive(Error)`