feat(defaults): map Y to y$ #13268

rationale:
- consistent with D and Y
- long recommended by Vim's own ":help Y"

close #13268
close #416
ref #6289

runtime/doc/change.txt

@@ -986,9 +986,9 @@ inside of strings can change!  Also see 'softtabstop' option. >
 
 							*Y*
 ["x]Y			yank [count] lines [into register x] (synonym for
-			yy, |linewise|).  If you like "Y" to work from the
-			cursor to the end of line (which is more logical,
-			but not Vi-compatible) use ":map Y y$".
+			yy, |linewise|).
+							*Y-default*
+			Mapped to "y$" by default. |default-mappings|
 
 							*zy*
 ["x]zy{motion}		Yank {motion} text [into register x].  Only differs

runtime/doc/vim_diff.txt

@@ -72,6 +72,11 @@ the differences.
 
 - |g:vimsyn_embed| defaults to "l" to enable Lua highlighting
 
+
+Default Mappings:					*default-mappings*
+  nnoremap Y y$
+  xnoremap Y y$
+
 ==============================================================================
 3. New Features						       *nvim-features*