Added [speaker_meta] shortcode and fixed a typo

Here is some documentation for http://conferencer.louddog.com/

Speaker Meta

Use the shortcode [speaker_meta] to display additional information about a speaker.

Options:
post_id  [list of IDs, false]  default: false
Set the speaker(s) for whom to display meta information.

show [list of values] default: title,company

speaker_prefix, title_prefix, company_prefix, speaker_suffix, title_suffix, company_suffix [text] default: ""
Add text prefixes or suffixes for any of the meta information.

e.g.  company_prefix="From: "

link_all [true or false] default: true
Set whether all or the meta data includes links to pages.


Examples:
#1 For a "speaker" named "John Doe" with a title of "Honcho" at a company called "Doe, Inc."

[speaker_meta]

Output:
<span class="title"><a href="/speakers/john-doe/">Honcho</a></span>
<span class="company"><a href="/companies/doe-inc/">Doe, Inc.</a></span>

#2 For a "speaker" named "John Doe" with a title of "Honcho" at a company called "Doe, Inc."

[speaker_meta link_all="false" show="speaker,title,company" company_prefix="Representing: "]

<span class="speaker">John Doe</span>
<span class="title">Honcho</span>
<span class="company">Represeting: Doe, Inc.</span>