Spell fix

Author: tdegeus

doc/commands.doc

@@ -1608,11 +1608,11 @@ contains \c TEST, or \c DEV
   to show a specific warning.
   \par Example:
 \verbatim
-\raisewarning My specific warnning
+\raisewarning My specific warning
 
 \warnNoDoc
 
-\warnNoDoc{My specific warnning}
+\warnNoDoc{My specific warning}
 \endverbatim
    together with:
 \verbatim
@@ -1621,9 +1621,9 @@ ALIASES += warnNoDoc{1}="\raisewarning Incomplete documentation: \1"
 \endverbatim
    will  result in:
 \verbatim
-   ex_1.md:1: warning: My specific warnning
+   ex_1.md:1: warning: My specific warning
    ex_1.md:3: warning: Missing documentation
-   ex_1.md:5: warning: Incomplete documentation: My specific warnning
+   ex_1.md:5: warning: Incomplete documentation: My specific warning
 \endverbatim
 
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