Fix typo in api-output.md

[humphd]

Removed an extra ) on code example for converting to gif

[lovell]

Thank you for fixing this David. Would you be able to update the incorrect source JSDoc too as part of this PR?

sharp/lib/output.js

Line 519 in d396a4e

* .toBuffer());

The docs/api-*.md files are auto-generated and would otherwise be overwritten again next time npm run docs-build is used.

sharp/package.json

Line 96 in d396a4e

"docs-build": "documentation lint lib && node docs/build && node docs/search-index/build",

[humphd]

Ah, thanks for pointing that out. I've made the change.

[lovell]

Brilliant, thank you!

[humphd]

Actually, thank you! Sharp is amazing. I've used it so many times for lots of projects. Recently I had my cloud computing students use it for a final project, and (as always) it worked flawlessly for them, even though they were all new to it. The docs especially set it apart.

Keep up the great work.