Update isAlphaNumeric.adoc

Author: lemio

Language/Functions/Characters/isAlphaNumeric.adoc

@@ -25,7 +25,7 @@ Analyse if a char is alphanumeric (that is a letter or a numbers). Returns true
 === Syntax
 [source,arduino]
 ----
-`isAlphaNumeric(thisChar)`
+isAlphaNumeric(thisChar)
 ----
 
 [float]
@@ -79,4 +79,4 @@ else
 * #LANGUAGE# link:../../communication/serial/read[read()]
 
 --
-// SEE ALSO SECTION ENDS
+// SEE ALSO SECTION ENDS