add dell SFP restriction warning

documentation/delta.md

@@ -1,6 +1,3 @@
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 # Flashing the Delta 7024 to a Dell 8024
 
 ## Disclaimer & Caveats
@@ -9,6 +6,8 @@ This page will guide you through flashing a Delta Networks 7024 (DNI7024F) to a
 ## Advantages
 The Delta switch comes with a very limited "demo build" of Fastpath, with little to no documentation. There's also no updates for it ever released. By switching to Dell, you gain regular firmware updates (as recent as a few months ago), and plenty of documentation. You get a more fleshed out OS including a web interface as well.  
 
+There's one downside: the Dell firmware is very picky about SFP+ optics. You must use Dell branded optics or they won't work. However if you're using DAC cables, any brand will work without issue.
+
 ## Prerequisites
 
 This guide assumes you're familiar with the basics like TFTP, obtaining a serial console to the device, etc. If you're not, this guide is probably not for you. Before touching your switch, read this document from beginning to end to get a basic idea of what you'll be doing - do **not** skip this step.  
@@ -275,4 +274,4 @@ You should not need this, but just in case you are curious: there is a hidden lo
 ### Contributing:
 The markdown source for these guides is hosted on [**our Github repo.**](https://github.com/Fohdeesha/quanta-brocade) If you have any suggested changes or additions feel free to submit a pull request.  
 
-```Documentation version:``` [ v0.5 (05-18-18)](https://github.com/Fohdeesha/quanta-brocade/commits/master) 
+```Documentation version:``` [ v0.6 (05-18-18)](https://github.com/Fohdeesha/quanta-brocade/commits/master)