Address name conflicts in EIEIO documentation (bug#31660)

* doc/misc/eieio.texi (Quick Start): Rename the class used in the
example from 'record' to 'person'.
(Building Classes): Advise user to check for name conflicts before
naming a class.  Add a missing apostrophe.
(Making New Objects): Correct grammar.  Rename the class used in the
example from 'record' to 'my-class'.
1 job for emacs-26 in 40 minutes and 23 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #1296
test

00:40:23