Document changes for #547 Fluoro exposure and duration times.

[Ed McDonagh]

Fluoro exposure and duration times.

[David Platten]

Adding first draft of documentation for fluoroscopy exposure time and duration [skip ci]. Do others thing this is in the correct place? References issue #550

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[Ed McDonagh]

http://docs.openrem.org/en/issue550documentfluorotimes/

[David Platten]

Trying to force 2nd line of heading onto next line in docs [skip ci]. References issue #550

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[David Platten]

2nd attempt at trying to force 2nd line of heading onto next line [skip ci]. References issue #550

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[David Platten]

@edmcdonagh and @LuukO, do you think that this note on the fluoroscopy times needs adding to, or screen shots, or should be moved elsewhere in the docs?

http://docs.openrem.org/en/issue550documentfluorotimes/i_navigate.html#a-note-on-time-data-for-fluoroscopy-studies

[Ed McDonagh]

Looks good to me. Do you want to update changes and merge it in?

[David Platten]

Updated changes files. Also corrected a spelling mistake. References issue #550

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