Fix typos in docstring

src/function_caller.jl

@@ -72,12 +72,12 @@ FunctionCallingCallback(func;
 ```
 
 The function calling callback lets you define a function `func(u,t,integrator)`
-which gets calls at the time points of interest. The constructor is:
+which gets called at the time points of interest. The constructor is:
 
   - `func(u, t, integrator)` is the function to be called.
   - `funcat` values or interval that the function is sure to be evaluated at.
   - `func_everystep` whether to call the function after each integrator step.
-  - `func_start` whether the function is called the initial condition.
+  - `func_start` whether the function is called at the initial condition.
   - `tdir` should be `sign(tspan[end]-tspan[1])`. It defaults to `1` and should
     be adapted if `tspan[1] > tspan[end]`.
 """