=doc fix PoisonPill typos

akka-docs/rst/images/actor_lifecycle.svg

@@ -319,7 +319,7 @@
            style="font-weight:normal;-inkscape-font-specification:'Franklin Gothic Medium, Oblique'"
            id="flowSpan8013"> or</flowSpan></flowPara><flowPara
          id="flowPara8005"
-         style="font-style:normal;-inkscape-font-specification:'Franklin Gothic Medium, Bold'">PosionPill</flowPara></flowRoot>    <text
+         style="font-style:normal;-inkscape-font-specification:'Franklin Gothic Medium, Bold'">PoisonPill</flowPara></flowRoot>    <text
        xml:space="preserve"
        style="font-size:8px;font-style:oblique;font-variant:normal;font-weight:normal;font-stretch:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Franklin Gothic Medium;-inkscape-font-specification:Sans"
        x="296.08759"