Remove stray char

Author: henry

specifics/700_beware_casts_and_generics_warnings.md

@@ -56,7 +56,7 @@ List<String> ls = l;
 The compiler will issue: 
 
 ```
-The expression of type List needs unchecked conversion to conform to List<String>`
+The expression of type List needs unchecked conversion to conform to List<String>
 ```
 
 Make sure that all such warnings should be addressed, either by imposing a zero compiler warnings policy or by configuring the compiler to treat them as errors.