CI: Don't run swiftformat

[doc only]

.circleci/config.yml

@@ -473,18 +473,12 @@ jobs:
       - run:
           name: Install lint tools
           command: |
-            brew install swiftlint swiftformat
+            brew install swiftlint
       - run:
           name: Run swiftlint
           command: |
             swiftlint version
             swiftlint --strict
-      - run:
-          name: Run swiftformat
-          command: |
-            swiftformat --version
-            swiftformat glean-core/ios samples/ios --swiftversion 5 --verbose
-            git diff --exit-code HEAD -- glean-core/ios samples/ios
 
   iOS build and test:
     macos:

docs/dev/ios/setup-ios-build-environment.md

@@ -5,7 +5,7 @@
 1. Install Xcode 11.0
 2. Install [Carthage](https://github.com/Carthage/Carthage): `brew install carthage`
 3. Ensure you have Python 3 installed: `brew install python`
-4. Install linting and formatting tools: `brew install swiftlint swiftformat`
+4. Install linting and formatting tools: `brew install swiftlint`
 5. Run `bin/bootstrap.sh` to download dependencies.
 6. (Optional, only required for building on the CLI) Install [xcpretty](https://github.com/xcpretty/xcpretty): `gem install xcpretty`