MeshTools: update fullScreenTriangle() docs.

src/Magnum/MeshTools/FullScreenTriangle.h

@@ -40,28 +40,28 @@
 namespace Magnum { namespace MeshTools {
 
 /**
-@brief Create full screen triangle mesh
+@brief Full screen triangle mesh
 
-Returns pre-configured mesh along with vertex buffer which can be used for
+Returns a pre-configured mesh along with vertex buffer which can be used for
-full-screen post-processing effects. The mesh is single triangle covering whole
+full-screen post-processing effects. The mesh is a single triangle covering
-screen area (@f$ (-1, -1) - (1, 1) @f$ on both dimensions) and provides only
+whole screen area (@f$ (-1, -1) - (1, 1) @f$ in both dimensions) and provides
-vertex positions, as other attributes (such as texture coordinates) can be
+only vertex positions, as other attributes (such as texture coordinates) can be
-computed from them. The vertex positions are, in order:
+calculated from them. The vertex positions are, in order:
 @f[
     \begin{pmatrix} -1 \\ 1 \end{pmatrix},
     \begin{pmatrix} -1 \\ -3 \end{pmatrix},
     \begin{pmatrix} 3 \\ 1 \end{pmatrix}
 @f]
 
-Based on @p version parameter, on OpenGL 2.1 and OpenGL ES 2.0 the vertex
+Based on the @p version parameter, on OpenGL 2.1, OpenGL ES 2.0 and WebGL 1 the
-positions are passed explicitly as attribute @cpp 0 @ce, contained in the
+vertex positions are passed explicitly as attribute @cpp 0 @ce, contained in
-buffer. On OpenGL 3.0+ and OpenGL ES 3.0+ the mesh is attribute-less and the
+a vertex buffer owned by the mesh. On OpenGL 3.0+, OpenGL ES 3.0+ and WebGL 2
-vertex positions can be computed using @glsl gl_VertexID @ce builtin shader
+the mesh is attribute-less and the vertex positions can be calculated using the
-variable,  thus @cpp nullptr @ce is returned instead of vertex buffer.
+@glsl gl_VertexID @ce builtin shader variable.
 
-Computing positions in vertex shader in a portable way might be done like this.
+Calculating positions in the shader in a portable way can be done like this.
-For OpenGL 2.1 and OpenGL ES 2.0 you then need to bind the location of `position`
+For OpenGL 2.1 and OpenGL ES 2.0 you then need to bind location of the
-attribute to @cpp 0 @ce.
+`position` attribute to @cpp 0 @ce.
 
 @code{.glsl}
 #if (!defined(GL_ES) && __VERSION__ >= 130) || (defined(GL_ES) && __VERSION__ >= 300)