Terraform Docs: Fix a typo (#1457)

### What
I fixed a typo in the document: `exisitng` -> `existing`


### Why
It improves the readability of document

### Screenshots
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### Merge Checklist
_If items do not apply to your changes, add (N/A) and mark them as
complete._

#### Pull Request
- [ ] Description links to related pull requests or issues, if any.

#### Content
- [ ] You added redirects to
`content/terraform-docs-common/redirects.jsonc` for moved, renamed, or
deleted pages **across all affected versions**. Refer to
[Redirects](https://github.com/hashicorp/web-unified-docs/blob/main/docs/content-guide/redirects.md#example-redirects)
for examples and guidance.
- [ ] Links to related content where appropriate (e.g., CLI, language,
API endpoints, permissions, etc.).
- [ ] Pages with related content are updated and link to this content
when appropriate.
- [ ] Sidebar navigation files have been updated for added, deleted,
reordered, or renamed pages.
- [ ] New pages have metadata (page name and description) at the top.
- [ ] New images are 2048 px wide. They have HashiCorp standard
annotation color (#F92672) and format (rectangle with rounded corners),
blurred sensitive details (e.g. credentials, usernames, user icons), and
descriptive alt text in the markdown for accessibility.
- [ ] New code blocks have the correct syntax and line breaks to
eliminate horizontal scroll bars.
- [ ] UI elements (button names, page names, etc.) are bolded.
- [ ] The Vercel website preview successfully deployed.

#### Reviews
- [ ] I or someone else reviewed the content for technical accuracy.
- [x ] I or someone else reviewed the content for typos, punctuation,
spelling, and grammar.

Author: crw

content/terraform/v1.14.x/docs/language/resources/index.mdx

@@ -42,4 +42,4 @@ As your infrastructure needs change, you may want to add or remove resources fro
 - [Remove a resource from state](/terraform/language/state/remove) describes how to remove a resource from state without destroying the actual infrastructure object.
 - [Destroy a resource](/terraform/language/resources/destroy) describes how to remove a resource from state and destroy the actual infrastructure.
 
-Many providers also allow you to read data from the provider so that you can use data from exisitng infrastructure without provisioning actual infrastructure objects. Refer to [Query data sources](/terraform/language/data-sources) for more information.
+Many providers also allow you to read data from the provider so that you can use data from existing infrastructure without provisioning actual infrastructure objects. Refer to [Query data sources](/terraform/language/data-sources) for more information.