Fix labelfloat properties

When building the presentation slides with version 2.36 of Graphviz,
the graphs that do not specify the labelfloat=true fully fail to build.
Using dot -T png rebase.txt -o rebase.html would show an error:

  Warning: rebase.txt: syntax error in line X near ']'

Change-Id: I7a4847e53ee57709042a62c24fe8f20c7544a912
diff --git a/presentations/git-gerrit-workshop/cherry-pick-concept-1.txt b/presentations/git-gerrit-workshop/cherry-pick-concept-1.txt
index fb6aa92..c362bac 100644
--- a/presentations/git-gerrit-workshop/cherry-pick-concept-1.txt
+++ b/presentations/git-gerrit-workshop/cherry-pick-concept-1.txt
@@ -10,8 +10,8 @@
 
   G -> D [style=invis]
   D -> C -> B -> A
-  F -> E [label=" diff-2", fontcolor=red, labelfloat]
-  E -> B [weight=0, label=" diff-1", fontcolor=red, labelfloat]
+  F -> E [label=" diff-2", fontcolor=red, labelfloat=true]
+  E -> B [weight=0, label=" diff-1", fontcolor=red, labelfloat=true]
 
 	edge [arrowhead=normal]
 	node [shape=box, style=filled, fillcolor=lightgrey, color=black]
diff --git a/presentations/git-gerrit-workshop/cherry-pick-concept-2.txt b/presentations/git-gerrit-workshop/cherry-pick-concept-2.txt
index a090f98..2de4add 100644
--- a/presentations/git-gerrit-workshop/cherry-pick-concept-2.txt
+++ b/presentations/git-gerrit-workshop/cherry-pick-concept-2.txt
@@ -8,10 +8,10 @@
 	edge [style=bold, color="#385d8a", arrowhead=none, fontname=arial, fontsize=16]
   G [style=filled, fillcolor=coral1, color=red]
 
-  G -> D [color=red, label=" diff-2", fontcolor=red, labelfloat]
+  G -> D [color=red, label=" diff-2", fontcolor=red, labelfloat=true]
   D -> C -> B -> A
-  F -> E [label=" diff-2", fontcolor=red, labelfloat]
-  E -> B [weight=0, label=" diff-1", fontcolor=red, labelfloat]
+  F -> E [label=" diff-2", fontcolor=red, labelfloat=true]
+  E -> B [weight=0, label=" diff-1", fontcolor=red, labelfloat=true]
 
 	edge [arrowhead=normal]
 	node [shape=box, style=filled, fillcolor=lightgrey, color=black]
diff --git a/presentations/git-gerrit-workshop/rebase.txt b/presentations/git-gerrit-workshop/rebase.txt
index ca27395..c05a28f 100644
--- a/presentations/git-gerrit-workshop/rebase.txt
+++ b/presentations/git-gerrit-workshop/rebase.txt
@@ -9,7 +9,7 @@
 
   D -> C -> B -> A
   F -> E [label=" diff-2", fontcolor=red, fontname=arial, fontsize=16]
-  E -> B [weight=0, label=" diff-1", fontcolor=red, labelfloat]
+  E -> B [weight=0, label=" diff-1", fontcolor=red, labelfloat=true]
   { rank=same; C; E }
   { rank=same; D; F }
 
@@ -50,18 +50,18 @@
 	edge [style=bold, color="#385d8a", arrowhead=none, fontname=arial, fontsize=16]
 
   D -> C -> B -> A
-  F -> E [label=" diff-2", fontcolor=red, labelfloat]
-  E -> B [weight=0, label=" diff-1", fontcolor=red, labelfloat]
+  F -> E [label=" diff-2", fontcolor=red, labelfloat=true]
+  E -> B [weight=0, label=" diff-1", fontcolor=red, labelfloat=true]
   { rank=same; C; E }
   { rank=same; D; F }
 
-  EP -> D [weight=0, color=red, label=" diff-1", fontcolor=red, labelfloat]
+  EP -> D [weight=0, color=red, label=" diff-1", fontcolor=red, labelfloat=true]
 
   D -> F [style=invis]
 
   FP [label="F'", style=filled, fillcolor=coral1, color=red]
   EP [label="E'", style=filled, fillcolor=coral1, color=red]
-  FP -> EP [color=red, label=" diff-2", fontcolor=red, labelfloat]
+  FP -> EP [color=red, label=" diff-2", fontcolor=red, labelfloat=true]
   EP -> F [style=invis]
 
 	edge [arrowhead=normal]