Merge rust-bitcoin/rust-miniscript#711: Fixed typos

9c8159199ede50b34b404a70913df190bc740b4d Fixed typos (Data Retriever)

Pull request description:

ACKs for top commit:
  tcharding:
    ACK 9c8159199ede50b34b404a70913df190bc740b4d
  apoelstra:
    ACK 9c8159199ede50b34b404a70913df190bc740b4d

Tree-SHA512: d2955699db5f4f1f5b2f9bfda34116f4ae0a91ae4e85f5b5e6ef63fd13de0e3dffcdfb2693a72e691f9cfd438f39ef8d24fe1d6970500305cd86da07b29b5a10

Author: heap-coder

src/descriptor/key.rs

@@ -390,7 +390,7 @@ fn fmt_derivation_path(f: &mut fmt::Formatter, path: &bip32::DerivationPath) ->
 }
 
 /// Writes multiple derivation paths to the formatter, no leading 'm'.
-/// NOTE: we assume paths only differ at a sindle index, as prescribed by BIP389.
+/// NOTE: we assume paths only differ at a single index, as prescribed by BIP389.
 /// Will panic if the list of paths is empty.
 fn fmt_derivation_paths(f: &mut fmt::Formatter, paths: &[bip32::DerivationPath]) -> fmt::Result {
     for (i, child) in paths[0].into_iter().enumerate() {

src/descriptor/mod.rs

@@ -644,7 +644,7 @@ impl Descriptor<DescriptorPublicKey> {
     /// # assert_eq!(descriptor.derived_descriptor(&secp, index).unwrap(), derived_descriptor);
     /// ```
     ///
-    /// and is only here really here for backwards compatbility.
+    /// and is only here really here for backwards compatibility.
     /// See [`at_derivation_index`] and `[derived_descriptor`] for more documentation.
     ///
     /// [`at_derivation_index`]: Self::at_derivation_index