minor doc fixes; add gh cli instructions

docs/architecture.md

@@ -54,7 +54,7 @@ require("./foobar/index.js"); // excessive specificity
 **Note:** I want to make _very_ clear that this is an experiment, not a claim
 that this is Objectively Better.
 
-### Any my [hyper]axe
+### And my [hyper]axe
 
 Converting JSON data to HTML templates is hard work. I started with Swig but
 when I realized it wasn't maintained I rewrote everything in EJS. I liked it a

docs/contributing.md

@@ -1,6 +1,6 @@
 # Contributing
 
-If you want to dive into the details, please see the [contract](./contract)
+If you want to dive into the details, please see the [contract](./contract.md)
 that defines the contributor role in this project. If you're comfortable with
 a top-level summary, you can start here first.
 

docs/maintaining.md

@@ -26,3 +26,10 @@ npm ci && npm test && npm start
 ```
 
 No need to add their fork as a remote.
+
+Or for ultimate convenience (and github lock-in), use the [github cli tool](https://cli.github.com):
+
+```sh
+gh pr list
+gh pr checkout 42
+```