Run cargo doc before cargo test

This patch fixes the builds by running cargo doc before cargo test.
Without generated documentation, we don’t have anything to test.

.builds/archlinux-msrv.yml

@@ -16,6 +16,7 @@ tasks:
       cargo build --release
   - test: |
       cd rusty-man
+      cargo doc
       cargo test
 triggers:
   - action: email

.builds/archlinux.yml

@@ -27,6 +27,7 @@ tasks:
       cargo build --release
   - test: |
       cd rusty-man
+      cargo doc
       cargo test
   - clippy: |
       cd rusty-man