message: Modify alpha_complex_persistence utility documentation accordingly to code change
diff: @@ -46,6 +46,8 @@ for the Alpha complex construction.
  coefficient field Z/pZ for computing homology.
  * `-m [ --min-persistence ]` (default = 0) Minimal lifetime of homology feature
  to be recorded. Enter a negative value to see zero length intervals.
  +* `-e [ --exact ]` for the exact computation version.
  +* `-f [ --fast ]` for the fast computation version.
  **Example**
  