[docs] fix: Add correct parameters for set_attribute in installation.md

[Prasanthi-Peram]

Reference : https://github.com/jump-dev/JuMP.jl/blob/master/src/optimizer_interface.jl

From the implementation of the
set_optimizer_attribute( model::Union{GenericModel,MOI.OptimizerWithAttributes}, attr::Union{AbstractString,MOI.AbstractOptimizerAttribute}, value) method;

The function expects three parameters however Installation Guide uses a (model,key value pair) in the solvers' section which throws a Method Error at runtime. This fix would solve the issue.

[odow]

Ooops! That's an embarrassing mistake on my part.

Thanks for the PR. I've tweaked it slightly to make the code block a jldoctest. This will run the code when we build the documentation to check that it runs without error.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (812a073) to head (7048553).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #3957   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           43        43           
  Lines         6054      6054           
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  Hits          6054      6054           

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[odow]

Thanks!