Corrected information regarding the constraining of DILUTE

[AlfredMayhew]

The manual states that DILUTE can't be constrained, but this isn't true. I've corrected the manual, hopefully this is all OK.

Thanks,
Alfie

[codecov]

Codecov Report

Merging #481 (2cb41a1) into master (25dafef) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #481   +/-   ##
=======================================
  Coverage   65.54%   65.54%           
=======================================
  Files          17       17           
  Lines        2046     2046           
=======================================
  Hits         1341     1341           
  Misses        705      705           

Flag	Coverage Δ
build	52.27% <ø> (ø)
tests	83.11% <ø> (ø)
unittests	31.62% <ø> (ø)

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[rs028]

Nicely spotted, thanks!