doc: Update syntax.

Julien LepillerTue Jun 11 18:13:17+0200 2019

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doc: Update syntax.

doc/home.md

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easily be kept in version control with git for instance. The file looks
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like this:
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```scm
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```scheme
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(use-modules (home))
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(home "/data/alice" '())

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Import home modules with name _module-name_. For instance,
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```scm
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```scheme
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(use-home-modules openbox hexchat)
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```
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is equivalent to:
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```scm
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```scheme
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(use-modules (home openbox)
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             (home hexchat))
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```