Fix header version macro descriptions in docs

(cherry picked from commit e17ffcd0db4541816ebf4cf973ebcee18e287733)

include/GLFW/glfw3.h

@@ -276,23 +276,24 @@ extern "C" {
 
 /*! @name GLFW version macros
  *  @{ */
-/*! @brief The major version number of the GLFW library.
+/*! @brief The major version number of the GLFW header.
  *
- *  This is incremented when the API is changed in non-compatible ways.
+ *  The major version number of the GLFW header.  This is incremented when the
+ *  API is changed in non-compatible ways.
  *  @ingroup init
  */
 #define GLFW_VERSION_MAJOR          3
-/*! @brief The minor version number of the GLFW library.
+/*! @brief The minor version number of the GLFW header.
  *
- *  This is incremented when features are added to the API but it remains
- *  backward-compatible.
+ *  The minor version number of the GLFW header.  This is incremented when
+ *  features are added to the API but it remains backward-compatible.
  *  @ingroup init
  */
 #define GLFW_VERSION_MINOR          3
-/*! @brief The revision number of the GLFW library.
+/*! @brief The revision number of the GLFW header.
  *
- *  This is incremented when a bug fix release is made that does not contain any
- *  API changes.
+ *  The revision number of the GLFW header.  This is incremented when a bug fix
+ *  release is made that does not contain any API changes.
  *  @ingroup init
  */
 #define GLFW_VERSION_REVISION       5