Merge rust-bitcoin/rust-miniscript#786: Update error message when parsing DescriptorPublicKey

7f7f547ff1ce7412b39ada5990e5ec4b55f6f8f5 Update error message when parsing DescriptorPublicKey (Sanket Kanjalkar)

Pull request description:

  Sorry if there are lint issues, I can try fixing them later. I am directly editing from github web UI

ACKs for top commit:
  brunoerg:
    ACK 7f7f547ff1ce7412b39ada5990e5ec4b55f6f8f5
  apoelstra:
    ACK 7f7f547ff1ce7412b39ada5990e5ec4b55f6f8f5; successfully ran local tests; looks like linter is happy

Tree-SHA512: b2a8896d911eedb72eb646a9d3a5176e47441c5c8d58e909c4a4029e16dac3a64309057f08eae024bb7d4369cc058595f224982f29f80dd67a21850b3262cb7d

Author: heap-coder

src/descriptor/key.rs

@@ -486,7 +486,8 @@ impl FromStr for DescriptorPublicKey {
         // A "raw" public key without any origin is the least we accept.
         if s.len() < 64 {
             return Err(DescriptorKeyParseError(
-                "Key too short (<66 char), doesn't match any format",
+                "Key too short (<64 characters); use parse_descriptor for parsing \
+                 descriptors with private keys.",
             ));
         }