Python: Fix grammar in change-note

Co-authored-by: Taus <tausbn@github.com>

Author: RasmusWL

python/ql/lib/change-notes/2023-01-16-new-call-graph.md

@@ -1,4 +1,4 @@
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 category: majorAnalysis
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-* We use a new analysis for the call-graph (determining which function is called). This can lead to changed results. In most cases this is much more accurate than the old call-graph that was based on points-to, but we do loose a few valid edges in the call-graph, especially around methods that are not defined inside its' class.
+* We use a new analysis for the call-graph (determining which function is called). This can lead to changed results. In most cases this is much more accurate than the old call-graph that was based on points-to, but we do lose a few valid edges in the call-graph, especially around methods that are not defined inside its' class.