Misc bugs with User Guide

In https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/prof-heap.html the image appears to be missing (it seems to be missing a .png extension).

In https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/hp2ps.html the use of -seascape is suggested but the version of gv I have (3.7.4) only supports -orientation=seascape.

Edited Mar 10, 2019 by Rufflewind

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