docs(input): update bindings documentation

Binding documentation was missing the updates from the recent copy paste
updates.

Author: ddkasa

src/textual/widgets/_input.py

@@ -128,18 +128,27 @@ class Input(ScrollView):
     | Key(s) | Description |
     | :- | :- |
     | left | Move the cursor left. |
+    | shift+left | Move cursor left and select. |
     | ctrl+left | Move the cursor one word to the left. |
     | right | Move the cursor right or accept the completion suggestion. |
+    | ctrl+shift+left | Move cursor left a word and select. |
+    | shift+right | Move cursor right and select. |
     | ctrl+right | Move the cursor one word to the right. |
     | backspace | Delete the character to the left of the cursor. |
+    | ctrl+shift+right | Move cursor right a word and select. |
     | home,ctrl+a | Go to the beginning of the input. |
     | end,ctrl+e | Go to the end of the input. |
+    | shift+home | Select up to the input start. |
+    | shift+end | Select up to the input end. |
     | delete,ctrl+d | Delete the character to the right of the cursor. |
     | enter | Submit the current value of the input. |
     | ctrl+w | Delete the word to the left of the cursor. |
     | ctrl+u | Delete everything to the left of the cursor. |
     | ctrl+f | Delete the word to the right of the cursor. |
     | ctrl+k | Delete everything to the right of the cursor. |
+    | ctrl+x | Cut selected text. |
+    | ctrl+c | Copy selected text. |
+    | ctrl+v | Paste text from the clipboard. | 
     """
 
     COMPONENT_CLASSES: ClassVar[set[str]] = {