MRG: minor fixes to release docs after v4.7.0 (#2498)

Minor updates after releasing v4.7.0, following the maturin-inspired
changes in #2386, #2481, and #2479.

* fix chdir command
* use PR rather than issue for release notes
* update zenodo URL for checking zenodo DOI minting

doc/release.md

@@ -25,7 +25,7 @@ Releasing to PyPI:
 After release to PyPI and conda-forge/bioconda packages built:
 
 - [ ] [PyPI page](https://pypi.org/project/sourmash/) updated
-- [ ] Zenodo DOI successfully minted upon new github release - [see search results](https://zenodo.org/search?page=1&size=20&q=sourmash)
+- [ ] Zenodo DOI successfully minted upon new github release - [see search results](https://zenodo.org/search?page=1&size=20&q=sourmash&sort=mostrecent)
 - [ ] `pip install sourmash` installs the correct version
 - [ ] `mamba create -n smash-release -y sourmash` installs the correct version
 ```
@@ -66,7 +66,7 @@ Developer updates:
 Dependabot updates:
 ```
 
-A convenient way to edit release notes is to put them in a [hackmd.io](https://hackmd.io) document and edit/display them there; then, create a "draft release notes for v..." issue and paste the markdown into the issue.
+A convenient way to edit release notes is to put them in a [hackmd.io](https://hackmd.io) document and edit/display them there; then, create a "draft release notes for v..." issue and paste the markdown into the release PR.
 
 ## Testing a release
 
@@ -185,7 +185,7 @@ NOTE: If you delete the rc tag before the rc wheels are done building, they
 may get added to the wrong release.
 
 ```
-cd ../sourmash
+cd ../../sourmash
 git tag -d v${new_version}${rc}
 git push --delete origin v${new_version}${rc}
 ```