Building the docs, again

[Iavor Diatchki]

Hello,

sometime ago, I asked if it is possible to build just the GHC docs, without
building the compiler.  I was told to just run `make html`.  This does not
appear to work, the command seems to just start building GHC.  What am I
doing wrong?

Here is the output I see, running the command from the root of the GHC tree.

> make html V=0
===--- building phase 0
make --no-print-directory -f ghc.mk phase=0 phase_0_builds
make[1]: Nothing to be done for 'phase_0_builds'.
===--- building phase 1
make --no-print-directory -f ghc.mk phase=1 phase_1_builds
  HC [stage 0] compiler/stage1/build/BufWrite.o
  HC [stage 0] compiler/stage1/build/Pretty.o
compilation IS NOT required
  HC [stage 0] compiler/stage1/build/PprColour.o
compilation IS NOT required
  HC [stage 0] compiler/stage1/build/Outputable.o
compilation IS NOT required
  HC [stage 0] compiler/stage1/build/Json.o
compilation IS NOT required
  HC [stage 0] compiler/stage1/build/SrcLoc.o
compilation IS NOT required
  HC [stage 0] compiler/stage1/build/BasicTypes.o
compilation IS NOT required
  HC [stage 0] compiler/stage1/build/Unique.o
  HC [stage 0] compiler/stage1/build/Packages.o-boot
compilation IS NOT required
  HC [stage 0] compiler/stage1/build/FiniteMap.o
compilation IS NOT required
  HC [stage 0] compiler/stage1/build/Name.o-boot

(then I interrupted it).

Also, in `mk/config.mk` I see this:
BUILD_SPHINX_HTML        = YES

-Iavor
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