Normalize capitalization to "OpenPGP card"

README.md

@@ -79,7 +79,7 @@ ignore the lower level crates as implementation details.
 ## Acknowledgements
 
 This project is based on the 
-[OpenPGP Card spec](https://gnupg.org/ftp/specs/OpenPGP-smart-card-application-3.4.1.pdf),
+[OpenPGP card spec](https://gnupg.org/ftp/specs/OpenPGP-smart-card-application-3.4.1.pdf),
 version 3.4.1.
 
 Other helpful resources included:

openpgp-card-sequoia/src/main.rs

@@ -30,7 +30,7 @@ const TEST_ENC_MSG: &str = "../example/encrypted_to_25519.asc";
 fn main() -> Result<(), Box<dyn Error>> {
     env_logger::init();
 
-    // Ident of an OpenPGP Card to use for these tests
+    // Ident of an OpenPGP card to use for these tests
     let test_card_ident = env::var("TEST_CARD_IDENT");
 
     if let Ok(test_card_ident) = test_card_ident {

openpgp-card-sequoia/src/sq_util.rs

@@ -3,7 +3,7 @@
 
 //! Simple wrappers for performing very specific tasks with Sequoia PGP.
 //!
-//! These helpers are (almost) entirely unrelated to OpenPGP Card.
+//! These helpers are (almost) entirely unrelated to OpenPGP card.
 
 use anyhow::{anyhow, Context, Result};
 use std::io;