Merge rust-bitcoin#4953: fix: improve comment accuracy in ecdsa-psbt example

93b0831 fix: improve comment accuracy in ecdsa-psbt example (Daniel)

Pull request description:

  Correct `scep context `to `secp context` on line 93
  Fix article usage: `an watch-only` to `a watch-only` on line 153


ACKs for top commit:
  apoelstra:
    ACK 93b0831; successfully ran local tests


Tree-SHA512: c696fbba314a5354ee062977f2a4d29e77f1b6e2ff1753d6288485f324f4706992a15b3299645c73a530fc1a4c8e9b6989101ef01567e3173489d527e4b3018e

Author: apoelstra

bitcoin/examples/ecdsa-psbt.rs

@@ -90,7 +90,7 @@ fn main() -> Result<()> {
     Ok(())
 }
 
-// We cache the pubkeys for convenience because it requires a scep context to convert the private key.
+// We cache the pubkeys for convenience because it requires a secp context to convert the private key.
 /// An example of an offline signer i.e., a cold-storage device.
 struct ColdStorage {
     /// The master extended private key.
@@ -150,7 +150,7 @@ impl ColdStorage {
     }
 }
 
-/// An example of an watch-only online wallet.
+/// An example of a watch-only online wallet.
 struct WatchOnly {
     /// The xpub for account 0 derived from derivation path "m/84h/0h/0h".
     account_0_xpub: Xpub,