chore(docs): remove leftover wording (gnolang#2203)

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## Description

This PR removes leftover wording from the overview page in the docs.

<details><summary>Contributors' checklist...</summary>

- [x] Added new tests, or not needed, or not feasible
- [x] Provided an example (e.g. screenshot) to aid review or the PR is
self-explanatory
- [x] Updated the official documentation or not needed
- [x] No breaking changes were made, or a `BREAKING CHANGE: xxx` message
was included in the description
- [x] Added references to related issues and PRs
- [ ] Provided any useful hints for running manual tests
- [ ] Added new benchmarks to [generated
graphs](https://gnoland.github.io/benchmarks), if any. More info
[here](https://github.com/gnolang/gno/blob/master/.benchmarks/README.md).
</details>

docs/overview.md

@@ -10,7 +10,7 @@ version of the Go programming language called Gno."
 ## What is Gno.land?
 
 Gno.land is a Layer 1 blockchain platform that enables the execution of Smart Contracts using an interpreted
-version of the Go programming language called Gno (Gno for short).
+version of the Go programming language called Gno.
 
 ### Key Features and Technology