fix: linting

base/mf_mval.sas

@@ -1,8 +1,9 @@
 /**
   @file mf_mval.sas
   @brief Returns a macro variable value if the variable exists
-  @details Use this macro to avoid repetitive use of `%if %symexist(MACVAR) %then`
-  type logic.  
+  @details
+  Use this macro to avoid repetitive use of `%if %symexist(MACVAR) %then`
+  type logic.
   Usage:
 
       %if %mf_mval(maynotexist)=itdid %then %do;