minor nav links tweak, fixed missing parenthesis

Author: pjazdzyk

README.md

@@ -10,7 +10,7 @@
 
 ---
 
-#### [USER GUIDE](USER_GUIDE.md) | [DESCRIPTION](#short-description) | [TECH](#tech) | [FUNCTIONALITY](#current-functionality) | [COLLABORATION](#collaboration) | [LEGAL DISCLAIMER](#legal-disclaimer) | REFERENCE SOURCES](#reference-sources) | [ACKNOWLEDGMENTS](#acknowledgments)
+### [USER GUIDE](USER_GUIDE.md) | [DESCRIPTION](#short-description) | [TECH](#tech) | [FUNCTIONALITY](#current-functionality) | [COLLABORATION](#collaboration) | [LEGAL DISCLAIMER](#legal-disclaimer) | [REFERENCE SOURCES](#reference-sources) | [ACKNOWLEDGMENTS](#acknowledgments)
 
 ---
 

USER_GUIDE.md

@@ -6,7 +6,7 @@
 
 ---
 
-#### [HOME](README.md) | [DUCT NETWORK MODEL](#duct-network-model) | [ROOM MODEL](#room-model) | [USE EXAMPLE](#use-example)
+### [HOME](README.md) | [DUCT NETWORK MODEL](#duct-network-model) | [ROOM MODEL](#room-model) | [USE EXAMPLE](#use-example)
 
 ---