Update README.md

README.md

@@ -24,7 +24,7 @@ If you want to build Optimism, check out the [Protocol Specs](./specs/).
 
 ## Community
 
-General discussion happens most frequently on the [Optimism discord](https://discord.optimism.io).
+General discussion happens most frequently on the [Optimism discord](https://discord-gateway.optimism.io/).
 Governance discussion can also be found on the [Optimism Governance Forum](https://gov.optimism.io/).
 
 ## Contributing
@@ -138,7 +138,7 @@ When merging commits to the `develop` branch you MUST include a changeset file i
 
 To add a changeset, run the command `yarn changeset` in the root of this monorepo.
 You will be presented with a small prompt to select the packages to be released, the scope of the release (major, minor, or patch), and the reason for the release.
-Comments with in changeset files will be automatically included in the changelog of the package.
+Comments within changeset files will be automatically included in the changelog of the package.
 
 ### Triggering Releases