Fix typos

example.exs

@@ -19,7 +19,7 @@ sheet1 =
   # the datetime: true parameter automatically applies conversion to Excels internal format.
   |> Sheet.set_cell("A2", {{2015, 11, 30}, {21, 20, 38}}, datetime: true)
   |> Sheet.set_cell("A3", 1_448_882_362, datetime: true)
-  # datetime: true ouputs date and time, yyyymmdd limits the output to just the date
+  # datetime: true outputs date and time, yyyymmdd limits the output to just the date
   |> Sheet.set_cell("A4", 1_448_882_362, yyyymmdd: true)
   # make some room in the first column, otherwise the date will only show up as ###
   |> Sheet.set_col_width("A", 18.0)

lib/elixlsx/util.ex

@@ -224,7 +224,7 @@ defmodule Elixlsx.Util do
     {:excelts, value}
   end
 
-  # Formula's value calculate on opening excel programm.
+  # Formula's value calculate on opening excel program.
   # We don't need to format this here.
   @spec to_excel_datetime({:formula, String.t()}) :: {:formula, String.t()}
   def to_excel_datetime({:formula, value}) do

lib/elixlsx/xml_templates.ex

@@ -671,7 +671,7 @@ defmodule Elixlsx.XMLTemplates do
     end
   end
 
-  # Creates an aligment xml tag from font style.
+  # Creates an alignment xml tag from font style.
   @spec make_style_alignment(Font.t()) :: String.t()
   defp make_style_alignment(font) do
     attrs =