Fix typos (#18604)

* Fix typos

Found via `codespell -q 3 -S ./CHANGELOG.md,./AUTHORS.md,./config/locales,./app/javascript/mastodon/locales -L ba,keypair,medias,pixelx,ro`

* Follow-up typo fix

.github/workflows/linter.yml

@@ -55,7 +55,7 @@ jobs:
         with:
           node-version: 16.x
           cache: yarn
-      - name: Intall dependencies
+      - name: Install dependencies
         run: yarn install --frozen-lockfile
       - name: Set-up RuboCop Problem Mathcher
         uses: r7kamura/rubocop-problem-matchers-action@v1