Reformulate RCtrl+v description

RCtrl+v is the only scrcpy shortcut related to copy-paste. Since it's
not a real "paste", reformulate to indicate that it injects the
clipboard content as text events.

README.md

@@ -580,7 +580,7 @@ device).
  | Rotate device screen                        | `RCtrl`+`r`
  | Expand notification panel                   | `RCtrl`+`n`
  | Collapse notification panel                 | `RCtrl`+`Shift`+`n`
- | Paste computer clipboard to device          | `RCtrl`+`v`
+ | Inject computer clipboard text              | `RCtrl`+`v`
  | Enable/disable FPS counter (on stdout)      | `RCtrl`+`i`
 
 _¹Double-click on black borders to remove them._  

app/scrcpy.1

@@ -279,7 +279,7 @@ Collapse notification panel
 
 .TP
 .B RCtrl+v
-Paste computer clipboard to device
+Inject computer clipboard text
 
 .TP
 .B RCtrl+i

app/src/cli.c

@@ -243,7 +243,7 @@ scrcpy_print_usage(const char *arg0) {
         "        Collapse notification panel\n"
         "\n"
         "    RCtrl+v\n"
-        "        Paste computer clipboard to device\n"
+        "        Inject computer clipboard text\n"
         "\n"
         "    RCtrl+i\n"
         "        Enable/disable FPS counter (print frames/second in logs)\n"