[docs] update getting_started_with_julia.jl (#3534)

docs/src/tutorials/getting_started/getting_started_with_julia.jl

@@ -249,7 +249,7 @@ isapprox(1e-9, 0.0; atol = 1e-8)
 # It's important to note that this issue isn't Julia-specific. It happens in
 # every programming language (try it out in Python).
 
-# ## Vectors, matrices and arrays
+# ## Vectors, matrices, and arrays
 
 # Similar to MATLAB, Julia has native support for vectors, matrices and tensors;
 # all of which are represented by arrays of different dimensions. Vectors are
@@ -626,7 +626,7 @@ end                         #hide
 # the opening `(`. This works for _any_ function, including functions with
 # multiple arguments. For example:
 
-f.([1, 2, 3])
+foo.([1, 2, 3])
 
 # !!! tip
 #     Get a `MethodError` when calling a function that takes a `Vector`,