docs: fix formatting of spindle dict section heading

Author: KurtJacobson

docs/src/config/python-interface.txt

@@ -486,7 +486,8 @@ by the configuration parameter [JOINT_n]UNITS)
 *velocity*:: '(returns float)' -
 current velocity.
 
-== The 'spindle' dictionary [[sec:the-spindle-dictionary] ==
+== The `spindle` dictionary [[sec:the-spindle-dictionary]
+
 *brake*:: '(returns integer)' -
 value of the spindle brake flag.
 
@@ -577,7 +578,7 @@ c.flood(linuxcnc.FLOOD_OFF)
 
 c.home(2)
 
-c.jog(linuxcnc.JOG_STOP, jogmode, axis) 
+c.jog(linuxcnc.JOG_STOP, jogmode, axis)
 c.jog(linuxcnc.JOG_CONTINUOUS, jogmode, axis, velocity)
 c.jog(linuxcnc.JOG_INCREMENT, jogmode, axis, velocity, increment)
 
@@ -725,7 +726,7 @@ import linuxcnc
 c = linuxcnc.command()
 
 #Increase speed of spindle 0 by 100rpm. Spindle must be on first
-c.spindle(linuxcnc.INCREASE) 
+c.spindle(linuxcnc.INCREASE)
 
 #Increase speed of spindle 2 by 100rpm. Spindle must be on first
 c.spindle(linuxcnc.SPINDLE_INCREASE, 2)
@@ -745,7 +746,7 @@ c.spindle.(linuxcnc.SPINDLE_OFF, 0)
 
 
 `spindleoverride(float [, int])`::
-    set spindle override factor. Defaults to spindle 0. 
+    set spindle override factor. Defaults to spindle 0.
 
 `state(int)`::
     set the machine state. Machine state should be STATE_ESTOP, STATE_ESTOP_RESET, STATE_ON, or STATE_OFF