Merge #15: Fix small typos in ci README

b44c53b Fix small typos in ci README (raphjaph)

Pull request description:

  I was going through the README trying to add the `rust-bitcoin` CI to my [BIP-322](https://github.com/raphjaph/bip322) crate and found some small things I needed to change to make it work for me.

ACKs for top commit:
  tcharding:
    ACK b44c53b
  apoelstra:
    utACK b44c53b

Tree-SHA512: a77ad368746588ac5df66b10421b285f1bfe49a49e903b4a6c6b0f2f1730c150b39945ecc2712f7eb757894489747ad07cd73fd133a21c53fbfe890d5ed37d03

Author: apoelstra

ci/README.md

@@ -75,7 +75,7 @@ All repositories MUST include a `REPO_DIR/contrib/crates.sh` script:
 CRATES=("base58" "bitcoin" "fuzz" "hashes" "internals" "io" "units")
 ```
 
-`CRATES` MUST be an array. If repository is not a workspace use `CRATES=(".")`).
+`CRATES` MUST be an array. If repository is not a workspace use `CRATES=(".")`.
 
 ### Per crate environment variables
 
@@ -178,7 +178,7 @@ jobs:
 Have a file in the repository root with the nightly toolchain version to use.
 
 ```bash
-$ cat nightly_version
+$ cat nightly-version
 nightly-2024-04-30
 ```
 
@@ -222,4 +222,4 @@ jobs:
         run: cp Cargo-${{ matrix.dep }}.lock Cargo.lock
       - name: "Run test script"
         run: ./maintainer-tools/ci/run_task.sh nightly
-```
+```