Update 03-create.md to include whitespace definition

[kagross]

Including a definition for whitespace the first time that it comes into play in the lesson could erase some confusion for students that don't know the word.

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[gdevenyi]

Thanks for the addition, can you maybe wrap this in a callout box?

[colinmorris]

These changes are actually inside a callout box already (under the heading "Good names for files and directories"). I don't think they can be nested.

What if we replaced "whitespace" with "spaces"?

Practically speaking, I think it's exceedingly uncommon for someone to think to use tabs, newlines, or more exotic whitespace characters in filenames. I imagine anyone savvy enough to be aware of the existence of whitespace characters other than ' ' will probably also be able to intuit that they shouldn't go in filenames.

[gcapes]

@colinmorris Nice neat suggestion and rationale.

[gdevenyi]

Sorry, I'm not clear on the suggestion here, are we suggesting changes all mentions of "whitespace" to "spaces"?

[gcapes]

Yep. Sacrificing a little bit of detail for simplicity.

[gcapes]

@kagross Thanks for bringing this up. This has now been fixed/sidestepped in #915.