+ Fixed mode for some examples

docs/sysutex/ex71.pp

@@ -1,5 +1,7 @@
 Program example71;
 
+{$mode objfpc}
+
 { This program demonstrates the Format function }
 
 Uses sysutils;

docs/sysutex/ex82.pp

@@ -1,5 +1,7 @@
 Program Example82;
 
+{$mode objfpc}
+
 { This program demonstrates the StrToInt function }
 
 Uses sysutils;

docs/sysutex/ex83.pp

@@ -1,5 +1,7 @@
 Program Example82;
 
+{$mode objfpc}
+
 { This program demonstrates the StrToInt function }
 
 Uses sysutils;