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doc: cookbook: Clarify what keywords are.

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* doc/guix-cookbook.texi (A Scheme Crash Course): Clarify what keywords
are.
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Ludovic Courtès 2020-10-15 23:50:11 +02:00
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@ -250,8 +250,10 @@ definitions.
@end lisp
@item
The keyword syntax is @code{#:}; it is used to create unique identifiers.
@pxref{Keywords,,, guile, GNU Guile Reference Manual}.
@dfn{Keywords} are typically used to identify the named parameters of a
procedure. They are prefixed by @code{#:} (hash, colon) followed by
alphanumeric characters: @code{#:like-this}.
@xref{Keywords,,, guile, GNU Guile Reference Manual}.
@item
The percentage @code{%} is typically used for read-only global variables in