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Added example of how to avoid repeat allocations when calling GMRES for multiple values of the right-hand side b, following the discussion in this discourse thread: https://discourse.julialang.org/t/iterativesolvers-jl-not-working-as-expected-with-mutating-and-allocation/110277/10.
I haven't been able to preview the result because I can't get Documenter to make the docs (I'm not super familiar with making documentation pages, and it keeps complaining about missing docs, even when I have cloned the master branch without any modifications), but since I am only adding to a markdown file I think it should work fine as long as everyone is satisfied with the content.