Add/update language syntax highlight tags for fenced code block examples

[abhro]

Commit cherry-picked from #1246, and removed from there since it's a big enough diff to barely make it worth it to have its own PR.

[github-actions]

Benchmark Results (Julia vlts)

Time benchmarks

	master	0931871...	master / 0931871...
multivariate/solvers/first_order/AdaMax	0.547 ± 0.011 ms	0.546 ± 0.011 ms	1 ± 0.028
multivariate/solvers/first_order/Adam	0.546 ± 0.011 ms	0.543 ± 0.01 ms	1 ± 0.028
multivariate/solvers/first_order/BFGS	0.266 ± 0.01 ms	0.266 ± 0.01 ms	1 ± 0.055
multivariate/solvers/first_order/ConjugateGradient	0.178 ± 0.0031 ms	0.177 ± 0.0028 ms	1.01 ± 0.024
multivariate/solvers/first_order/GradientDescent	1.57 ± 0.013 ms	1.58 ± 0.012 ms	0.999 ± 0.011
multivariate/solvers/first_order/LBFGS	0.236 ± 0.01 ms	0.236 ± 0.0098 ms	1 ± 0.06
multivariate/solvers/first_order/MomentumGradientDescent	2.2 ± 0.019 ms	2.2 ± 0.015 ms	1 ± 0.011
multivariate/solvers/first_order/NGMRES	0.441 ± 0.014 ms	0.45 ± 0.014 ms	0.979 ± 0.043
time_to_load	0.294 ± 0.0011 s	0.291 ± 0.0022 s	1.01 ± 0.0085

Memory benchmarks

	master	0931871...	master / 0931871...
multivariate/solvers/first_order/AdaMax	0.34 k allocs: 7.28 kB	0.34 k allocs: 7.28 kB	1
multivariate/solvers/first_order/Adam	0.34 k allocs: 7.28 kB	0.34 k allocs: 7.28 kB	1
multivariate/solvers/first_order/BFGS	0.281 k allocs: 13.3 kB	0.281 k allocs: 13.3 kB	1
multivariate/solvers/first_order/ConjugateGradient	0.294 k allocs: 14.7 kB	0.294 k allocs: 14.7 kB	1
multivariate/solvers/first_order/GradientDescent	1.73 k allocs: 0.0757 MB	1.73 k allocs: 0.0757 MB	1
multivariate/solvers/first_order/LBFGS	0.298 k allocs: 15 kB	0.298 k allocs: 15 kB	1
multivariate/solvers/first_order/MomentumGradientDescent	2.07 k allocs: 0.081 MB	2.07 k allocs: 0.081 MB	1
multivariate/solvers/first_order/NGMRES	1.39 k allocs: 0.114 MB	1.39 k allocs: 0.114 MB	1
time_to_load	0.153 k allocs: 14.5 kB	0.153 k allocs: 14.5 kB	1

A plot of the benchmark results has been uploaded as an artifact at .

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	master	0931871...	master / 0931871...
multivariate/solvers/first_order/AdaMax	0.636 ± 0.0097 ms	0.638 ± 0.0097 ms	0.997 ± 0.022
multivariate/solvers/first_order/Adam	0.635 ± 0.0098 ms	0.636 ± 0.0096 ms	0.999 ± 0.022
multivariate/solvers/first_order/BFGS	0.228 ± 0.0057 ms	0.228 ± 0.009 ms	1 ± 0.046
multivariate/solvers/first_order/ConjugateGradient	0.0517 ± 0.00072 ms	0.0517 ± 0.0007 ms	1 ± 0.019
multivariate/solvers/first_order/GradientDescent	1.7 ± 0.012 ms	1.7 ± 0.012 ms	1 ± 0.0097
multivariate/solvers/first_order/LBFGS	0.229 ± 0.0056 ms	0.229 ± 0.0057 ms	0.999 ± 0.035
multivariate/solvers/first_order/MomentumGradientDescent	2.46 ± 0.021 ms	2.46 ± 0.019 ms	0.999 ± 0.011
multivariate/solvers/first_order/NGMRES	0.583 ± 0.013 ms	0.567 ± 0.013 ms	1.03 ± 0.034
time_to_load	0.295 ± 0.0008 s	0.295 ± 0.0011 s	1 ± 0.0047

Memory benchmarks

	master	0931871...	master / 0931871...
multivariate/solvers/first_order/AdaMax	0.354 k allocs: 7.19 kB	0.354 k allocs: 7.19 kB	1
multivariate/solvers/first_order/Adam	0.354 k allocs: 7.19 kB	0.354 k allocs: 7.19 kB	1
multivariate/solvers/first_order/BFGS	0.266 k allocs: 9.7 kB	0.266 k allocs: 9.7 kB	1
multivariate/solvers/first_order/ConjugateGradient	0.108 k allocs: 4.89 kB	0.108 k allocs: 4.89 kB	1
multivariate/solvers/first_order/GradientDescent	2 k allocs: 0.0708 MB	2 k allocs: 0.0708 MB	1
multivariate/solvers/first_order/LBFGS	0.336 k allocs: 13.7 kB	0.336 k allocs: 13.7 kB	1
multivariate/solvers/first_order/MomentumGradientDescent	2.39 k allocs: 0.0793 MB	2.39 k allocs: 0.0793 MB	1
multivariate/solvers/first_order/NGMRES	2.62 k allocs: 0.129 MB	2.62 k allocs: 0.129 MB	1
time_to_load	0.145 k allocs: 11 kB	0.145 k allocs: 11 kB	1

A plot of the benchmark results has been uploaded as an artifact at .

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.48%. Comparing base (96d0b65) to head (0931871).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1247   +/-   ##
=======================================
  Coverage   86.48%   86.48%           
=======================================
  Files          44       44           
  Lines        3596     3596           
=======================================
  Hits         3110     3110           
  Misses        486      486           

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[pkofod]

Thanks, appreciate it!