Update isGraph.adoc

Author: lemio

Language/Functions/Characters/isGraph.adoc

@@ -25,7 +25,7 @@ Analyse if a char is printable with some content (space is printable but has no
 === Syntax
 [source,arduino]
 ----
-`isGraph(thisChar)`
+isGraph(thisChar)
 ----
 
 [float]
@@ -79,4 +79,4 @@ else
 * #LANGUAGE# link:../../communication/serial/read[read()]
 
 --
-// SEE ALSO SECTION ENDS
+// SEE ALSO SECTION ENDS