Add "from the upstream sequence"

Author: cjsha

articles/hardware/rhs2116/rhs2116-stimulate.md

@@ -26,13 +26,13 @@ when the its internal conditional statement is evaluated is true. `Double` emits
 <xref:System.Double> to <xref:OpenEphys.Onix1.Rhs2116StimulusTrigger> anytime it receives an item in
 its upstream sequence. 
 
-When `Rhs2116StimulusTrigger` receives a double, a stimulus is triggered. The value of the double
-determines the duration of a precise hardware delay between triggering and actually delivering the
-stimulus. If the double is zero, there is no hardware delay. The stimulus waveform delivered is
-configured in the [Headstage RHS2116 GUI](xref:rhs2116_gui). If the sequencer is busy or the
-stimulator is disarmed when the trigger occurs, stimulus won't be delivered. This can be checked
-using the <xref: OpenEphys.Onix1.Rhs2116TriggerData> operator as demonstrated in the <xref:
-rhs2116_trigger_data> page.
+When `Rhs2116StimulusTrigger` receives a double from the upstream sequence, a stimulus is triggered.
+The value of the double determines the duration of a precise hardware delay between triggering and
+actually delivering the stimulus. If the double is zero, there is no hardware delay. The stimulus
+waveform delivered is configured in the [Headstage RHS2116 GUI](xref:rhs2116_gui). If the sequencer
+is busy or the stimulator is disarmed when the trigger occurs, stimulus won't be delivered. This can
+be checked using the <xref: OpenEphys.Onix1.Rhs2116TriggerData> operator as demonstrated in the
+<xref: rhs2116_trigger_data> page.
 
 `Rhs2116StimulusTrigger`'s DeviceName property is set to "HeadstageRhs2116/StimulusTrigger" to link
 this operator to the Rhs2116 devices on the Headstage Rhs2116.