Docs:Grammar Fix (#11020)

<!--
  Have any questions? Check out the contributing docs at https://gatsby.app/contribute, or
  ask in this Pull Request and a Gatsby maintainer will be happy to help :)
-->

## Description

<!-- Write a brief description of the changes introduced by this PR -->

## Related Issues

<!--
  Link to the issue that is fixed by this PR (if there is one)
  e.g. Fixes #1234, Addresses #1234, Related to #1234, etc.
-->

Author: techyontach

docs/docs/deploying-to-now.md

@@ -52,7 +52,7 @@ This `now.json` file will allow us to do several things, specifically:
 
 - Use the [latest Now 2.0 version](https://zeit.co/blog/now-2) of [the platform](https://zeit.co/docs/v2/platform/overview/)
 - Set the project name to `my-gatsby-project`
-- Use the [@now/static-build builder](https://zeit.co/docs/v2/deployments/official-builders/static-build-now-static-build/) to take the `package.json` file as an entrypoint and use the `public` directory as the our content directory
+- Use the [@now/static-build builder](https://zeit.co/docs/v2/deployments/official-builders/static-build-now-static-build/) to take the `package.json` file as an entrypoint and use the `public` directory as our content directory
 
 The final step is to add a script to the `package.json` which will build our application: