Update introduction.adoc

[thomas-saigre]

Add json specifications for boundaries conditions
also minor typo fixes

@prudhomm @vincentchabannes can you please review that this additions are corrects ? I'm not sure in particular of expr1 and expr2 for Robin conditions

• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you fixed a Bug ?
• Have you added the documentation of the example or benchmark ?
• Have you successfully run the example or benchmark?
• Have you documented the results?
• Have you added the images to the documentation?
• Have you added the vtkjs files for 3D visualization in the documentation?
• Have you added the vtkjs files to a Data Management Plateform e.g https://girder.math.unistra.fr

---

[prudhomm]

@thomas-saigre I propose some minor changes

[prudhomm]

@thomas-saigre @vincentchabannes the PR deploy using netlify should appear any time soon

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[prudhomm]

@thomas-saigre please could you codeadd some explanation for initial conditions as well ?

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[prudhomm]

perhaps a good idea to have different kind of conditions for different border to examplify ?

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[prudhomm]

perhaps add a comment that this will be considered a non-linear condition due to the presence of heat_T``code ? an alternative to avoid that is to use heat_T_rt (@vincent is this correct?) so that heat_T from previous iteration is used(time or non-linear)

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[prudhomm]

stress out that Robin provide a linear boundary condition so term implying non-linearity cannot be used. Again same trick with _rt (remove trial) could be used to avoid that

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