Typo in reference manual

[Eric Hanchrow]

In File: guile-ref.info,  Node: General option interface, I see

     - procedure: <group>-disble OPTION-SYMBOL
     - procedure: read-disble OPTION-SYMBOL
     - procedure: print-disble OPTION-SYMBOL
     - procedure: debug-disble OPTION-SYMBOL

All instances of `disble', above, should of course be changed to
`disable'.

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