There are issues with the man3 glGetBufferParameter pages.
There are two xml sources in
The former is incomplete and is missing the glGetBufferParameteri64v function (defined in section 6.1.9 of the OpenGL 3.3 specification) and which should be used to query BUFFER_SIZE, BUFFER_MAP_OFFSET and BUFFER_MAP_LENGTH states (as table 6.7 page 283).
The later has the function but mentions less targets.
The xhtml Makefile only uses the former and thus, on the web side, only the former has a web page (as http://www.opengl.org/sdk/docs/man3/xhtml/glGetBufferParameter.xml).