More doc strings

Author: ufechner7

docs/src/functions.md

@@ -4,6 +4,7 @@ CurrentModule = WinchControllers
 ## Input functions
 ```@docs
 set_vset_pc
+reset
 ```
 
 ## Output functions

docs/src/types.md

@@ -7,6 +7,7 @@ CurrentModule = WinchControllers
 ## Control components
 ```@docs
 Integrator
+Integrator(dt, i=1.0, x0=0.0)
 UnitDelay
 RateLimiter
 Mixer_2CH

src/components.jl

@@ -26,10 +26,31 @@ $(TYPEDFIELDS)
     last_output = 0.0
 end
 
+"""
+    Integrator(dt, i=1.0, x0=0.0)
+
+Constructor for discrete integrator with external reset.
+
+# Parameters
+
+- dt: timestep [s]
+- i:  integration constant
+- x0: initial and last output
+"""
 function  Integrator(dt, i=1.0, x0=0.0)
     Integrator(dt, i, x0, x0)
 end
 
+"""
+    reset(int::Integrator, x0=0.0)
+
+Reset the integrator `int` to the value `x0`.
+
+# Parameters
+
+- int::Integrator: An integrator struct
+- x0: default value =0.0; initial and last output
+"""
 function reset(int::Integrator, x0=0.0)
     int.output = x0
     int.last_output = x0