Remove a remaining trailing quote

Author: jnavila

book/03-git-branching/sections/workflows.asc

@@ -23,7 +23,7 @@ It's generally easier to think about them as work silos, where sets of commits g
 
 [[lrbranch_b]]
 .A "`silo`" view of progressive-stability branching
-image::images/lr-branches-2.png[A “silo” view of progressive-stability branching']
+image::images/lr-branches-2.png[A “silo” view of progressive-stability branching]
 
 You can keep doing this for several levels of stability.
 Some larger projects also have a `proposed` or `pu` (proposed updates) branch that has integrated branches that may not be ready to go into the `next` or `master` branch.