Fixed minor typo in FSComp.txt

src/fsharp/FSComp.txt

@@ -1403,7 +1403,7 @@ keywordDescriptionTo,"Used in for loops to indicate a range."
 keywordDescriptionTry,"Used to introduce a block of code that might generate an exception. Used together with with or finally."
 keywordDescriptionType,"Used to declare a class, record, structure, discriminated union, enumeration type, unit of measure, or type abbreviation."
 keywordDescriptionUpcast,"Used to convert to a type that is higher in the inheritance chain."
-keywordDescriptionUse,"Used instead of let for values that implement IDisposable""
+keywordDescriptionUse,"Used instead of let for values that implement IDisposable"
 keywordDescriptionUseBang,"Used instead of let! in computation expressions for computation expression results that implement IDisposable."
 keywordDescriptionVal,"Used in a signature to indicate a value, or in a type to declare a member, in limited situations."
 keywordDescriptionVoid,"Indicates the .NET void type. Used when interoperating with other .NET languages."