Change 'nonnegative' to 'non-negative' for consistency

[fingolfin]

No description provided.

[codecov]

Codecov Report

Merging #1539 (d84b30d) into master (26abdc4) will not change coverage.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1539   +/-   ##
=======================================
  Coverage   84.04%   84.04%           
=======================================
  Files          94       94           
  Lines       36613    36613           
=======================================
  Hits        30772    30772           
  Misses       5841     5841           

Files Changed	Coverage Δ
src/arb/ComplexMat.jl	80.69% <ø> (ø)
src/arb/Real.jl	88.50% <ø> (ø)
src/arb/RealMat.jl	78.61% <ø> (ø)
src/arb/acb_mat.jl	81.48% <ø> (ø)
src/arb/arb.jl	88.30% <ø> (ø)
src/arb/arb_mat.jl	81.45% <ø> (ø)
src/flint/fmpq.jl	85.78% <ø> (ø)
src/flint/fmpz.jl	91.30% <ø> (ø)
src/flint/fmpz_mod_poly.jl	94.86% <ø> (ø)
src/flint/gfp_fmpz_poly.jl	97.03% <ø> (ø)
... and 4 more

... and 2 files with indirect coverage changes

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