Fix naming in F#

Author: lulunac27a

text-counter-f-sharp-application/text-counter-fable/src/App.fs

@@ -2,7 +2,7 @@ module App
 
 open Browser.Dom
 // Text content area
-let textcontent =
+let textContent =
     document.getElementById ("textContent") :?> Browser.Types.HTMLTextAreaElement
 
 // Update text counter button
@@ -15,7 +15,7 @@ let textOutput =
 // Update text counter output when button is clicked
 updateText.onclick <-
     fun _ ->
-        let textString = textcontent.value
+        let textString = textContent.value
         let characters = textString.Length //number of characters
         let words = textString.Split(' ').Length //number of words
         let lines = textString.Split('\n').Length //number of lines