Merge #516: Fix broken links

ade888e Check for broken links in CI (Tobin C. Harding)
e3f6d23 Fix incorrect method name in docs (Tobin C. Harding)

Pull request description:

  - Patch 1: Fix broken link (links to recently removed deprecated function)
  - Patch 2: Add `-- -D rustdoc::broken-intra-doc-links` to CI

  cc dpc, wasn't on this repo but you brought this to my attention, thanks man!

ACKs for top commit:
  apoelstra:
    ACK ade888e

Tree-SHA512: febe4dc3d8831d59edcc6ae1e6b31c48bc1ab8765a7c074573657350e906cd877ef2ed486adc656b09f3e2471d11cd3e57072a33f2f0279eb9cd13b2102f1cd7

Author: apoelstra

contrib/test.sh

@@ -64,7 +64,7 @@ fi
 
 # Build the docs if told to (this only works with the nightly toolchain)
 if [ "$DO_DOCS" = true ]; then
-    RUSTDOCFLAGS="--cfg docsrs" cargo doc --all --features="$FEATURES"
+    RUSTDOCFLAGS="--cfg docsrs" cargo rustdoc --features="$FEATURES" -- -D rustdoc::broken-intra-doc-links
 fi
 
 # Webassembly stuff

src/key.rs

@@ -1301,10 +1301,10 @@ impl XOnlyPublicKey {
         }
     }
 
-    /// Verifies that a tweak produced by [`XOnlyPublicKey::tweak_add_assign`] was computed correctly.
+    /// Verifies that a tweak produced by [`XOnlyPublicKey::add_tweak`] was computed correctly.
     ///
     /// Should be called on the original untweaked key. Takes the tweaked key and output parity from
-    /// [`XOnlyPublicKey::tweak_add_assign`] as input.
+    /// [`XOnlyPublicKey::add_tweak`] as input.
     ///
     /// Currently this is not much more efficient than just recomputing the tweak and checking
     /// equality. However, in future this API will support batch verification, which is