Examples update for gas-solid fluidized and spouted-bed

[OresteMarquis]

Description

Update of the .prm and .rst files of the gas-solid fluidized and spouted-bed examples for the Lethe 1.0 release.

Miscellaneous (will be removed when merged)

Checklist (will be removed when merged)

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Code related list:

• Lethe documentation is up to date
• Copyright headers are present and up to date
• The branch is rebased onto master
• Code is indented with indent-all and .prm files (examples and tests) with prm-indent
• Links are added to parent .rst files
• The example is following the standard format

Pull request related list:

• Labels are applied
• There are at least 2 reviewers (or 1 if small feature) excluding the responsible for the merge
• If this PR closes an issue or is related to a project, it is linked in the "Projects" or "Development" section
• If any future works is planned, an issue is opened
• The PR description is cleaned and ready for merge

[blaisb]

Some comments there and there. A generic piece of advice @OresteMarquis is to put as little parameters as possible in the prm file. If the parameter is not modified, then don't put it in the paramter file, the default value will be fine :)

[OresteMarquis]

How can I know what is the default, so I know what can be removed? I haven't used Lethe enough to know them.

[blaisb]

How can I know what is the default, so I know what can be removed? I haven't used Lethe enough to know them.

The default values are in the prm template that can be generated with the template parameter executable. I'll show you later if you want.