Fix code example errors

[heitortsergent]

What?

Fix a few code example errors and ESLint error messages.

Checklist

• I have used a meaningful title for the PR.
• I have described the changes I've made in the "What?" section above.
• I have performed a self-review of my changes.
• I have run the npm start command locally and verified that the changes look good.

• I have made my changes in the docs/sources/next folder of the documentation.
• I have reflected my changes in the docs/sources/v{most_recent_release} folder of the documentation.
• I have reflected my changes in the relevant folders of the two previous k6 versions of the documentation (if still applicable to previous versions).

Related PR(s)/Issue(s)

[heitortsergent]

I'm still getting the following ESLint errors, and I'm not sure how to fix it 😞.

✖ eslint -c ./docs/sources/.eslintrc.js --fix:

/Users/heitorts/Documents/GitHub/k6-docs/docs/sources/next/javascript-api/k6-browser/browsercontext/clearpermissions.md
  18:1  error  Parsing error: No Babel config file detected for /Users/heitorts/Documents/GitHub/k6-docs/docs/sources/next/javascript-api/k6-browser/browsercontext/clearpermissions.md/0_0.javascript. Either disable config file checking with requireConfigFile: false, or configure Babel so that it can find the config files

/Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/browsercontext/clearpermissions.md
  18:1  error  Parsing error: No Babel config file detected for /Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/browsercontext/clearpermissions.md/0_0.javascript. Either disable config file checking with requireConfigFile: false, or configure Babel so that it can find the config files

/Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/browsercontext/close.md
  20:1  error  Parsing error: No Babel config file detected for /Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/browsercontext/close.md/0_0.javascript. Either disable config file checking with requireConfigFile: false, or configure Babel so that it can find the config files

/Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/browsercontext/grantpermissions.md
  30:1  error  Parsing error: No Babel config file detected for /Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/browsercontext/grantpermissions.md/0_0.javascript. Either disable config file checking with requireConfigFile: false, or configure Babel so that it can find the config files

/Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/browsercontext/pages.md
  27:1  error  Parsing error: No Babel config file detected for /Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/browsercontext/pages.md/0_0.javascript. Either disable config file checking with requireConfigFile: false, or configure Babel so that it can find the config files

/Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/browsercontext/setgeolocation.md
  38:1  error  Parsing error: No Babel config file detected for /Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/browsercontext/setgeolocation.md/0_0.javascript. Either disable config file checking with requireConfigFile: false, or configure Babel so that it can find the config files

/Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/context.md
  24:1  error  Parsing error: No Babel config file detected for /Users/heitorts/Documents/GitHub/k6-docs/docs/sources/v0.97.x/javascript-api/k6-browser/context.md/0_0.javascript. Either disable config file checking with requireConfigFile: false, or configure Babel so that it can find the config files

[heitortsergent]

It looks like the files that ESLint was throwing the error were just missing async as part of the default function statement. :)

[inancgumus]

LGTM 👍 Thanks for fixing this ❤️