doc: my engrish iz bad.

doc/triangle.dox

@@ -131,10 +131,10 @@ MAGNUM_APPLICATION_MAIN(TriangleExample)
 
 That's all, now we can compile the whole example using CMake. Apart from the
 standard CMake setup related to version requirements and paths to
-`FindMagnum.cmake`, `FindSDL2.cmake` and `FindCorrade.cmake`, as desribed in
+`FindMagnum.cmake`, `FindSDL2.cmake` and `FindCorrade.cmake`, as described in
 the @ref getting-started "Getting Started Guide", the setup is as follows.
 First we require the `Magnum` package with `GL`, `Shaders` and
-`Sdl2Application` components. It's recommended to use also Corrade's set of
+`Sdl2Application` components. It's recommended to also use Corrade's set of
 compiler flags to enable additional warnings. Then we create our executable and
 link to all Magnum libraries we requested. See @ref cmake for more information.