fix YaoArrayRegisters docstring

[codecov[bot]]

Codecov Report

Merging #374 (02e4e79) into master (50bac57) will increase coverage by 0.17%. The diff coverage is 96.66%.

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
+ Coverage   87.27%   87.45%   +0.17%     
==========================================
  Files          73       72       -1     
  Lines        3844     3849       +5     
==========================================
+ Hits         3355     3366      +11     
+ Misses        489      483       -6     

Impacted Files	Coverage Δ
lib/YaoArrayRegister/src/density_matrix.jl	95.83% <ø> (ø)
lib/YaoArrayRegister/src/operations.jl	96.05% <ø> (ø)
lib/YaoBlocks/src/abstract_block.jl	86.62% <ø> (ø)
lib/YaoBlocks/src/composite/repeated.jl	100.00% <ø> (ø)
lib/YaoArrayRegister/src/register.jl	97.59% <88.88%> (+0.03%)	:arrow_up:
lib/YaoArrayRegister/src/focus.jl	89.83% <100.00%> (+1.59%)	:arrow_up:
lib/YaoArrayRegister/src/instruct.jl	89.84% <100.00%> (ø)
lib/YaoArrayRegister/src/measure.jl	84.12% <100.00%> (-0.25%)	:arrow_down:
lib/YaoBlocks/src/composite/kron.jl	94.80% <100.00%> (ø)
lib/YaoBlocks/src/composite/put_block.jl	100.00% <100.00%> (ø)

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