removed backquote

Removed backquote in Syntax

Author: sebuls

Language/Functions/Characters/isHexadecimalDigit.adoc

@@ -25,7 +25,7 @@ Analyse if a char is an hexadecimal digit (A-F, 0-9). Returns true if thisChar c
 === Syntax
 [source,arduino]
 ----
-`isHexadecilamDigit(thisChar)`
+isHexadecilamDigit(thisChar)
 ----
 
 [float]
@@ -79,4 +79,4 @@ else
 * #LANGUAGE# link:../../communication/serial/read[read()]
 
 --
-// SEE ALSO SECTION ENDS
+// SEE ALSO SECTION ENDS