Procedural Generation is used on this wiki to indicate where procedural techniques are used in games which do not affect the game play 'significantly'. Examples include the use of procedural textures and animation. Whether something is procedural generation or procedural content generation is a continuum with procedural generation at one end and PCG at the other, as opposed to an absolute distinction.
While many techniques are common to both procedural generation and procedural content generation, the emphasis on this wiki has been on PCG rather than little 'p' procedural generation. Having said that, the wiki is also moving away from this stance. Feel free to contribute to the discussion on this issue on the discussion page of what PCG is.
PCG Wiki References
Procedural generation - Wikipedia article on Procedural generation.