Fix the order of arguments of symbolic dependent variables in tutorial

[bowenszhu]

following #165 (comment)

[codecov]

Codecov Report

Merging #170 (399439e) into master (55a7f61) will decrease coverage by 4.96%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
- Coverage   88.91%   83.94%   -4.97%     
==========================================
  Files          31       31              
  Lines        1389     1389              
==========================================
- Hits         1235     1166      -69     
- Misses        154      223      +69     

Impacted Files	Coverage Δ
src/interface/solution/timeindep.jl	0.00% <0.00%> (-100.00%)	⬇️
src/interface/solution/common.jl	30.23% <0.00%> (-34.89%)	⬇️
src/interface/solution/solution_utils.jl	78.57% <0.00%> (-21.43%)	⬇️
src/interface/solution/MOLMetadata.jl	80.00% <0.00%> (-20.00%)	⬇️
src/MOL_discretization.jl	65.62% <0.00%> (-17.19%)	⬇️
src/interface/solution/timedep.jl	73.33% <0.00%> (-16.67%)	⬇️
src/system_parsing/bcs/parse_boundaries.jl	97.02% <0.00%> (-1.00%)	⬇️
src/discretization/generate_bc_eqs.jl	82.22% <0.00%> (-0.75%)	⬇️
src/MOL_utils.jl	82.26% <0.00%> (-0.71%)	⬇️

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[ChrisRackauckas]

Thanks!