Add `swapwindow` and `no_focus_fallback` docs (#182)

* Add swapwindow dispatcher

* Add focus fallback

* Implement review feedback

pages/Configuring/Dispatchers.md

@@ -36,6 +36,7 @@ layout pages (See the sidebar).
 | pin | pins a window (i.e. show it on all workspaces) *note: floating only* | left empty / `active` for current, or `window` for a specific window |
 | movefocus | moves the focus in a direction | direction |
 | movewindow | moves the active window in a direction or to a monitor | direction or `mon:` and a monitor |
+| swapwindow | swaps the active window with another window in the given direction | direction |
 | centerwindow | center the active window *note: floating only* | none |
 | resizeactive | resizes the active window | resizeparams |
 | moveactive | moves the active window | resizeparams |

pages/Configuring/Variables.md

@@ -57,6 +57,7 @@ SHIFT CAPS CTRL/CONTROL ALT MOD2 MOD3 SUPER/WIN/LOGO/MOD4 MOD5
 | cursor_inactive_timeout | in seconds, after how many seconds of cursor's inactivity to hide it. Set to `0` for never. | int | 0 |
 | layout | which layout to use. (Available: `dwindle`, `master`) | str | dwindle |
 | no_cursor_warps | if true, will not warp the cursor in many cases (focusing, keybinds, etc) | bool | false |
+| no_focus_fallback | if true, will not fall back to the next available window when moving focus in a direction where no window was found | bool | false |
 | apply_sens_to_raw | if on, will also apply the sensitivity to raw mouse output (e.g. sensitivity in games) **NOTICE:** ***really*** not recommended. | bool | false |
 | resize_on_border | enables resizing windows by clicking and dragging on borders and gaps | bool | false |
 | extend_border_grab_area | extends the area around the border where you can click and drag on, only used when `general:resize_on_border` is on. | int | 15 |