Update README.md

README.md

@@ -84,9 +84,9 @@ GETTING STARTED
 
 The best way to get started is to read the thorough
 [download, build, install and start using Magnum](https://doc.magnum.graphics/magnum/getting-started.html)
-in your project. There is also a complete
+in your project. There is also a completed
 [building documentation](https://doc.magnum.graphics/magnum/building.html) — we
-provide packages for many platforms, including Windows, Linux and macOS. After
+provide packages for many platforms, including Windows, Linux, and macOS. After
 that, there are various [tutorials and examples](https://doc.magnum.graphics/magnum/example-index.html)
 and a complete [feature guide](https://doc.magnum.graphics/magnum/features.html)
 explaining all aspects of the library.
@@ -94,7 +94,7 @@ explaining all aspects of the library.
 Apart from that, various Magnum functionality is available through
 [single-header libraries](https://doc.magnum.graphics/magnum/singles.html).
 Just download a file, `#include` it in your project and you're ready to go! No
-buildsystem wrangling needed.
+buildsystem wrangling is needed.
 
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