docs: add links to Tahoe-LAFS for Paranoids and Tahoe-LAFS for Corporates in about...

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     <img src="http://allmydata.org/~zooko/network-and-reliance-topology.png"></img>
 
+    <p>(See also <a href="http://testgrid.allmydata.org:3567/file/URI:CHK:4rd7ous7b5xgbmpan6mmdbx3za:2jywqfnobreondkanwnekugmxv3cyuzdv34fpyazkb5htjmokdta:3:10:102761/@@named=/network-and-reliance-topology-paranoid.png">Tahoe-LAFS for Paranoids</a> and <a href="http://testgrid.allmydata.org:3567/file/URI:CHK:mpa737uu7suao7lva2axhbtgw4:5rpemho4d3cqsgvgsqmg3hbn2mzeibsbdpthmpyo5jwnj7f2fqfa:3:10:114022/@@named=/network-and-reliance-topology-corporate.png">Tahoe-LAFS for Corporates</a>.)</p>
+
     <p>A "storage grid" is made up of a number of storage servers.  A storage server has local attached storage (typically one or more hard disks).  A "gateway" uses the storage servers and provides a filesystem over a standard protocol such as HTTP(S), FUSE, SMB, or (S)FTP.</p>
     <p>Users do not rely on storage servers to provide <i>confidentiality</i> nor <i>integrity</i> for their data -- instead all of the data is encrypted and integrity-checked by the gateway, so that the servers can neither read nor alter the contents of the files.</p>
     <p>Users rely on storage servers for <i>availability</i>.  The ciphertext is erasure-coded and distributed across <cite>N</cite> storage servers (the default value for <cite>N</cite> is 10) so that it can be recovered from any <cite>K</cite> of these servers (the default value of <cite>K</cite> is 3).  Therefore only the simultaneous failure of <cite>N-K+1</cite> (with the defaults, 8) servers can make the data unavailable.</p>