Fix README.md typo (#13885)

**Description**

⚒️ Fix README.md typo 

**⚙️ Type of change**

- [ ] ⚙️ Feature/App addition
- [x] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

**🧪 How Has This Been Tested?**

N / A

**📃 Notes:**
<!-- Please enter any other relevant information here -->

**✔️ Checklist:**

- [x] ⚖️ My code follows the style guidelines of this project
- [x] 👀 I have performed a self-review of my own code
- [x] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [x] 📄 I have made corresponding changes to the documentation
- [x] ⚠️ My changes generate no new warnings
- [x] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [x] ⬆️ I increased versions for any altered app according to semantic
versioning

**➕ App addition**

If this PR is an app addition please make sure you have done the
following.

- [ ] 🪞 I have opened a PR on
[truecharts/containers](https://github.com/truecharts/containers) adding
the container to TrueCharts mirror repo.
- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

Signed-off-by: Gabriel Donadel Dall'Agnol <donadeldev@gmail.com>

.github/README.md

@@ -48,7 +48,7 @@ For big changes we do have a roadmap, every spot on the roadmap is synced to a T
 
 **Restructure of the Project - TrueNAS SCALE "Bluefin" 22.xx ALPHA 1**
 
-_The current project is hitting internal performance issues, for this reason we need to rework the structure and split some parts of the project into seperate repositories._
+_The current project is hitting internal performance issues, for this reason we need to rework the structure and split some parts of the project into separate repositories._
 
 <br />