update subtract docs based upon suggetion from issue
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-``bedtools subtract`` searches for features in B that overlap A. If an
-overlapping feature is found in B, the overlapping portion is removed from A
-and the remaining portion of A is reported. If a feature in B overlaps all of a
-feature in A, the A feature will not be reported.
+``bedtools subtract`` bedtools` subtract searches for features in B that overlap A by at least the number of base pairs given by the -f option. If an overlapping feature is found in B, the overlapping portion is removed from A and the remaining portion of A is reported. If a feature in B overlaps all of a feature in A, the A feature will not be reported. If a feature in B does not overlap a feature in A by at least the -f amount, the A feature will be reported in its entirety.
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