Embarassing typos.

src/Magnum/AbstractShaderProgram.h

@@ -560,7 +560,7 @@ class MAGNUM_EXPORT AbstractShaderProgram: public AbstractObject {
          * everything succeeded. Linker message (if any) is printed to error
          * output. All attached shaders must be compiled with
          * @ref Shader::compile() before linking. The operation is batched in a
-         * way that allows the driver to link multiple shaders simultaenously
+         * way that allows the driver to link multiple shaders simultaneously
          * (i.e. in multiple threads).
          * @see @fn_gl{LinkProgram}, @fn_gl{GetProgram} with
          *      @def_gl{LINK_STATUS} and @def_gl{INFO_LOG_LENGTH},

src/Magnum/Shader.h

@@ -433,12 +433,12 @@ class MAGNUM_EXPORT Shader: public AbstractObject {
         #endif
 
         /**
-         * @brief Compile multiple shaders simultaenously
+         * @brief Compile multiple shaders simultaneously
          *
          * Returns `false` if compilation of any shader failed, `true` if
          * everything succeeded. Compiler messages (if any) are printed to
          * error output. The operation is batched in a way that allows the
-         * driver to perform multiple compilations simultaenously (i.e. in
+         * driver to perform multiple compilations simultaneously (i.e. in
          * multiple threads).
          * @see @fn_gl{ShaderSource}, @fn_gl{CompileShader}, @fn_gl{GetShader}
          *      with @def_gl{COMPILE_STATUS} and @def_gl{INFO_LOG_LENGTH},

src/Magnum/Timeline.h

@@ -77,7 +77,7 @@ void MyApplication::drawEvent() {
     timeline.nextFrame();
 }
 @endcode
-@todo FPS should be governed by Application (imagine more than one simultaenous
+@todo FPS should be governed by Application (imagine more than one simultaneous
     timeline and the harm it could do, also vsync etc. can't be handled in
     platform-independent way here)
 */