Fixed broken smart quote.

src/docs/asciidoc/jme3/jme3_source_structure.adoc

@@ -190,7 +190,7 @@ a| Blender model import plugin (Desktop only)
 a| None
 
 a| dist/lib/jME3-networking.jar
-a| “Spidermonkey networking library
+a| "`Spidermonkey`" networking library
 a| None
 
 a| dist/lib/jME3-jogg.jar