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 />
 
@@ -60,7 +60,7 @@ _The shared Common (chart) basis, used by all our Charts, needs some significant
 
 **Increased test coverage - TrueNAS SCALE "Bluefin" 22.xx BETA 1**
 
-_With most parts of our project somewhat cleaned up, we need to work on increasing the coverage of our test system. Our unittests should cover all features and we should also take upgrades into account when testing Chart changes_
+_With most parts of our project somewhat cleaned up, we need to work on increasing the coverage of our test system. Our unit tests should cover all features and we should also take upgrades into account when testing Chart changes_
 
 <br />