Ensure last action's documentation is properly generated

The issue was caused by the documentation generation logic not writing the final buffered content.

src/build/webgen/main_actions.zig

@@ -50,9 +50,16 @@ pub fn genKeybindActions(writer: anytype) !void {
                 '\n',
             );
             while (iter.next()) |s| {
+                // If it is the last line and empty, then skip it.
+                if (iter.peek() == null and s.len == 0) continue;
                 try buffer.appendSlice(s);
                 try buffer.appendSlice("\n");
             }
         }
     }
+
+    // Write any remaining buffered documentation
+    if (buffer.items.len > 0) {
+        try writer.writeAll(buffer.items);
+    }
 }

src/input/Binding.zig

@@ -236,9 +236,9 @@ pub const Action = union(enum) {
     /// Send an `ESC` sequence.
     esc: []const u8,
 
-    // Send the given text. Uses Zig string literal syntax. This is currently
-    // not validated. If the text is invalid (i.e. contains an invalid escape
-    // sequence), the error will currently only show up in logs.
+    /// Send the given text. Uses Zig string literal syntax. This is currently
+    /// not validated. If the text is invalid (i.e. contains an invalid escape
+    /// sequence), the error will currently only show up in logs.
     text: []const u8,
 
     /// Send data to the pty depending on whether cursor key mode is enabled