Add some missing blank lines before code blocks

kitty/boss.py

@@ -677,6 +677,7 @@ class Boss:
         @ac:win: Set the background opacity for the active OS Window
 
         For example::
+
             map f1 set_background_opacity +0.1
             map f2 set_background_opacity -0.1
             map f3 set_background_opacity 0.5

kitty/tabs.py

@@ -495,6 +495,7 @@ class Tab:  # {{{
         @ac:win: Focus the neighboring window in the current tab
 
         For example::
+
             map ctrl+left neighboring_window left
             map ctrl+down neighboring_window bottom
         '''
@@ -507,6 +508,7 @@ class Tab:  # {{{
         @ac:win: Move the window in the specified direction
 
         For example::
+
             map ctrl+left move_window left
             map ctrl+down move_window bottom
         '''