[yocto] in yocto-docs, many <filename> tags should properly be <varname> tags

[Robert P. J. Day]

  pretty sure i mentioned this once upon a time but, for pedantic
precision, quite a few strings currently tagged with <filename> should
rather be tagged with <varname>. i'm currently proofing the kernel dev
manual and things like FILESPATH and FILESEXTRAPATHS are rendered with
the use of <filename>, which isn't really appropriate.

  *currently*, there is no difference in the final rendering of these
two tags, but one never knows when that might be desirable.

  obviously, not a high priority if any.

rday

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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