Update sessionization.md

Author: structured-query-language

sessionization.md

@@ -8,7 +8,7 @@ Whereas, timeseries analysis, usually uses "Gaps and Islands" - if there are no
 
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-|_Figure 2._ A session, for example, can be defined by threshold time such as if the next action is in a range of time greater than `T=50`, it defines the start of a new session. 
+|_Figure 1._ A session, for example, can be defined by threshold time such as if the next action is in a range of time greater than `T=50`, it defines the start of a new session. 
 
 
 ## An illustrative example