Update DMRG.md criticality

[jtschneider]

Regarding #1234

[mtfishman]

Could also add a note about criticality to:

ITensors.jl/src/mps/dmrg.jl

Lines 127 to 129 in 9d4fed1

	- `eigsolve_krylovdim::Int = 3` - maximum dimension of Krylov space used to
	locally solve the eigenvalue problem. Try setting to a higher value if
	convergence is slow. [^krylovkit]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (063ccbe) 85.36% compared to head (a77c480) 54.56%.
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Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1235       +/-   ##
===========================================
- Coverage   85.36%   54.56%   -30.81%     
===========================================
  Files          89       88        -1     
  Lines        8445     8392       -53     
===========================================
- Hits         7209     4579     -2630     
- Misses       1236     3813     +2577     

Files	Coverage Δ
src/mps/dmrg.jl	0.00% <ø> (-83.59%)	⬇️

... and 36 files with indirect coverage changes

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[mtfishman]

Thanks!