Improve documentation for consistency

Make --lock-video-orientation documentation consistent with that of
--rotation.

app/scrcpy.1

@@ -52,7 +52,7 @@ Print this help.
 
 .TP
 .BI "\-\-lock\-video\-orientation " value
-Lock video orientation to \fIvalue\fR. Values are integers in the range [-1..3]. Natural device orientation is 0 and each increment adds 90 degrees counterclockwise.
+Lock video orientation to \fIvalue\fR. Possible values are -1 (unlocked), 0, 1, 2 and 3. Natural device orientation is 0, and each increment adds a 90 degrees otation counterclockwise.
 
 Default is -1 (unlocked).
 

app/src/cli.c

@@ -52,9 +52,10 @@ scrcpy_print_usage(const char *arg0) {
         "        Print this help.\n"
         "\n"
         "    --lock-video-orientation value\n"
-        "        Lock video orientation to value. Values are integers in the\n"
+        "        Lock video orientation to value.\n"
-        "        range [-1..3]. Natural device orientation is 0 and each\n"
+        "        Possible values are -1 (unlocked), 0, 1, 2 and 3.\n"
-        "        increment adds 90 degrees counterclockwise.\n"
+        "        Natural device orientation is 0, and each increment adds a\n"
+        "        90 degrees rotation counterclockwise.\n"
         "        Default is %d%s.\n"
         "\n"
         "    --max-fps value\n"