misc: unify terminology

Start audio call
Start video call
jami-client-qt#1730 (comment 51880)

Change-Id: I97a071cec60791965a1c9f7c39c9ff9a9f0aeb7b
GitLab: #1730

bin/dbus/cx.ring.Ring.CallManager.xml

@@ -28,7 +28,7 @@
         <method name="placeCallWithMedia" tp:name-for-bindings="placeCallWithMedia">
             <tp:added version="9.10.0"/>
             <tp:docstring>
-              <p>Place a new call. This version allows passing the list of medias and their attributes.</p>
+              <p>Place a new call. This version allows passing the list of media and their attributes.</p>
             </tp:docstring>
             <arg type="s" name="accountId" direction="in">
               <tp:docstring>

src/manager.h

@@ -161,7 +161,7 @@ public:
      * @param accountId the user's account ID
      * @param callee the callee's ID/URI. Depends on the account type.
      * Refer to placeCall/placeCallWithMedia documentations.
-     * @param mediaList a list of medias to include
+     * @param mediaList a list of media to include
      * @return the call ID on success, empty string otherwise
      */
     std::string outgoingCall(const std::string& accountId,