Add documentation for Grid selection and column configuration

[ahie]

This change is 

[gilberto-torrezan]

Reviewed 2 of 2 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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flow-documentation/flow-components/tutorial-flow-grid.asciidoc, line 95 at r1 (raw file):

The current selection can be obtained from the [classname]#Grid# by
[methodname]#getSelectedItems()#, and the returned [classname]#Set# contains either

Those [methodname] and [classname] don't seem to affect the rendering in any way (at least I couldn't see any difference at https://github.com/vaadin/flow/blob/grid-documentation/flow-documentation/flow-components/tutorial-flow-grid.asciidoc ). Is this a syntax copied from the old documentation?

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Comments from Reviewable

[ahie]

Review status: all files reviewed at latest revision, 1 unresolved discussion, some commit checks failed.

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flow-documentation/flow-components/tutorial-flow-grid.asciidoc, line 95 at r1 (raw file):

Previously, gilberto-torrezan (Gilberto Torrezan) wrote…

Those [methodname] and [classname] don't seem to affect the rendering in any way (at least I couldn't see any difference at https://github.com/vaadin/flow/blob/grid-documentation/flow-documentation/flow-components/tutorial-flow-grid.asciidoc ). Is this a syntax copied from the old documentation?

Changed these to use backticks.

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Comments from Reviewable

[gilberto-torrezan]

Review status: all files reviewed at latest revision, 1 unresolved discussion, some commit checks failed.

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flow-documentation/flow-components/tutorial-flow-grid.asciidoc, line 95 at r1 (raw file):

Previously, ahie (Aleksi Hietanen) wrote…

Changed these to use backticks.

Did you push it? I don't see any changes.

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Comments from Reviewable

[gilberto-torrezan]

Reviewed 1 of 1 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable