Fix minor typo in Dockerfiles

Change-Id: Icdbf765e43557d4c2d469998cbf27f43487c76a8
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/docker/Webhook/Dockerfile b/docker/Webhook/Dockerfile
index 5a7b592..8373d5c 100644
--- a/docker/Webhook/Dockerfile
+++ b/docker/Webhook/Dockerfile
@@ -33,7 +33,7 @@
     && rm -rf /var/lib/apt/lists/*
 
 #######################################################################################
-# End of common prepration
+# End of common preparation
 
 ARG PYTHON3_OSM_WEBHOOK_TRANSLATOR_URL
 
@@ -61,7 +61,7 @@
 COPY --from=INSTALL /usr/local/lib/python3.10/dist-packages /usr/local/lib/python3.10/dist-packages
 
 #######################################################################################
-# End of common prepration
+# End of common preparation
 
 RUN rm -f /etc/apt/apt.conf.d/proxy.conf