misspelled reference "UseEntryGuardsAsDirectoryGuards" to obsolete config parameter in manual page

The manual page says

[[NumDirectoryGuards]] **NumDirectoryGuards** __NUM__::
    If UseEntryGuardsAsDirectoryGuards is enabled, we try to make sure we have
    at least NUM routers to use as directory guards. If this option is set to
    0, use the value from the guard-n-primary-dir-guards-to-use consensus
    parameter, and default to 3 if the consensus parameter isn't set.
    (Default: 0)

The (obsolete) config parameter with the closest spelling is UseEntryGuardsAsDirGuards at least according to config.c. The correct fix is probably to delete the conditional at the beginning of that sentence.

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