Update docs/optimizer/slackBusMainConnexComponent.md

Co-authored-by: Coline Piloquet <55250145+colinepiloquet@users.noreply.github.com>
Signed-off-by: Sophie Frasnedo <93923177+So-Fras@users.noreply.github.com>

docs/optimizer/slackBusMainConnexComponent.md

@@ -2,7 +2,7 @@
 
 The slack bus $s$ is determined by identifying the bus with the **highest number of AC branches connected**, within the main component (`cc` set to $0$ in `ampl_network_buses.txt`). 
 If multiple buses have such cardinality, the one with the highest identifier (`num` parameter) is chosen.
-In the event no bus satisfies these conditions, the first bus defined in `ampl_network_buses.txt` is selected.
+In the event that no bus satisfies these conditions, the first bus defined in `ampl_network_buses.txt` is selected.
 
 The OPFs are executed on the **main connex component** (i.e. buses connected to slack bus by AC branches) of the network.
 Consequently, **buses connected to the slack only by HVDC lines are excluded**.