Add language tags for C code sections

docs/monitor.dox

@@ -42,14 +42,14 @@ The primary monitor is returned by @ref glfwGetPrimaryMonitor.  It is the user's
 preferred monitor and is usually the one with global UI elements like task bar
 or menu bar.
 
-@code
+@code{.c}
 GLFWmonitor* primary = glfwGetPrimaryMonitor();
 @endcode
 
 You can retrieve all currently connected monitors with @ref glfwGetMonitors.
 See the reference documentation for the lifetime of the returned array.
 
-@code
+@code{.c}
 int count;
 GLFWmonitor** monitors = glfwGetMonitors(&count);
 @endcode
@@ -64,14 +64,14 @@ disconnected.
 If you wish to be notified when a monitor is connected or disconnected, set
 a monitor callback.
 
-@code
+@code{.c}
 glfwSetMonitorCallback(monitor_callback);
 @endcode
 
 The callback function receives the handle for the monitor that has been
 connected or disconnected and the event that occurred.
 
-@code
+@code{.c}
 void monitor_callback(GLFWmonitor* monitor, int event)
 {
     if (event == GLFW_CONNECTED)
@@ -109,7 +109,7 @@ Video modes are represented as @ref GLFWvidmode structures.  You can get an
 array of the video modes supported by a monitor with @ref glfwGetVideoModes.
 See the reference documentation for the lifetime of the returned array.
 
-@code
+@code{.c}
 int count;
 GLFWvidmode* modes = glfwGetVideoModes(monitor, &count);
 @endcode
@@ -117,7 +117,7 @@ GLFWvidmode* modes = glfwGetVideoModes(monitor, &count);
 To get the current video mode of a monitor call @ref glfwGetVideoMode.  See the
 reference documentation for the lifetime of the returned pointer.
 
-@code
+@code{.c}
 const GLFWvidmode* mode = glfwGetVideoMode(monitor);
 @endcode
 
@@ -132,7 +132,7 @@ retrieved with @ref glfwGetMonitorPhysicalSize.  This has no relation to its
 current _resolution_, i.e. the width and height of its current
 [video mode](@ref monitor_modes).
 
-@code
+@code{.c}
 int width_mm, height_mm;
 glfwGetMonitorPhysicalSize(monitor, &width_mm, &height_mm);
 @endcode
@@ -147,7 +147,7 @@ useful.  Instead, use the [monitor content scale](@ref monitor_scale) and
 The content scale for a monitor can be retrieved with @ref
 glfwGetMonitorContentScale.
 
-@code
+@code{.c}
 float xscale, yscale;
 glfwGetMonitorContentScale(monitor, &xscale, &yscale);
 @endcode
@@ -170,7 +170,7 @@ The position of the monitor on the virtual desktop, in
 [screen coordinates](@ref coordinate_systems), can be retrieved with @ref
 glfwGetMonitorPos.
 
-@code
+@code{.c}
 int xpos, ypos;
 glfwGetMonitorPos(monitor, &xpos, &ypos);
 @endcode
@@ -182,7 +182,7 @@ The area of a monitor not occupied by global task bars or menu bars is the work
 area.  This is specified in [screen coordinates](@ref coordinate_systems) and
 can be retrieved with @ref glfwGetMonitorWorkarea.
 
-@code
+@code{.c}
 int xpos, ypos, width, height;
 glfwGetMonitorWorkarea(monitor, &xpos, &ypos, &width, &height);
 @endcode
@@ -194,7 +194,7 @@ The human-readable, UTF-8 encoded name of a monitor is returned by @ref
 glfwGetMonitorName.  See the reference documentation for the lifetime of the
 returned string.
 
-@code
+@code{.c}
 const char* name = glfwGetMonitorName(monitor);
 @endcode
 
@@ -219,7 +219,7 @@ The initial value of the pointer is `NULL`.
 The gamma ramp of a monitor can be set with @ref glfwSetGammaRamp, which accepts
 a monitor handle and a pointer to a @ref GLFWgammaramp structure.
 
-@code
+@code{.c}
 GLFWgammaramp ramp;
 unsigned short red[256], green[256], blue[256];
 
@@ -245,7 +245,7 @@ ramp for that monitor.
 The current gamma ramp for a monitor is returned by @ref glfwGetGammaRamp.  See
 the reference documentation for the lifetime of the returned structure.
 
-@code
+@code{.c}
 const GLFWgammaramp* ramp = glfwGetGammaRamp(monitor);
 @endcode
 
@@ -253,7 +253,7 @@ If you wish to set a regular gamma ramp, you can have GLFW calculate it for you
 from the desired exponent with @ref glfwSetGamma, which in turn calls @ref
 glfwSetGammaRamp with the resulting ramp.
 
-@code
+@code{.c}
 glfwSetGamma(monitor, 1.0);
 @endcode