Added some TODOs.

src/AbstractFramebuffer.h

@@ -62,6 +62,7 @@ typedef Containers::EnumSet<FramebufferClear, GLbitfield,
 @requires_gl30 %Extension @extension{ARB,framebuffer_object}
 @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit} or
     @es_extension{NV,framebuffer_blit}
+@todo Remove redundant `%Buffer`
 */
 enum class FramebufferBlit: GLbitfield {
     ColorBuffer = GL_COLOR_BUFFER_BIT,    /**< Color buffer */

src/AbstractShaderProgram.h

@@ -316,6 +316,7 @@ comes in handy.
 
 @see @ref portability-shaders
 
+@todo Use Containers::ArrayReference for setting uniform arrays?
 @todo Compiling and linking more than one shader in parallel, then checking
     status, should be faster -- https://twitter.com/g_truc/status/352778836657700866
 @todo `GL_NUM_{PROGRAM,SHADER}_BINARY_FORMATS` + `GL_{PROGRAM,SHADER}_BINARY_FORMATS` (vector), (@extension{ARB,ES2_compatibility})

src/Shader.h

@@ -42,6 +42,8 @@ namespace Magnum {
 
 See @ref AbstractShaderProgram for more information.
 
+@todoc Usage...
+
 @section Shader-performance-optimization Performance optimizations
 
 %Shader limits and implementation-defined values (such as @ref maxUniformComponents())