fix(docs): syntax error in example code

[yujunz]

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature (please, look at the "Scope of the project" section in the README.md file)
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

N/A

Does this PR introduce a breaking change?

• Yes
• No

Other information

N/A

[yujunz]

Flake?

2020/03/25 06:44:05 could not resolve the version 'latest' to an actual version number: could not get releases from github.com/bazelbuild/bazel: could not download list of Bazel releases from github.com/bazelbuild: unexpected status code while reading https://api.github.com/repos/bazelbuild/bazel/releases: 403

Exited with code exit status 1