Apply suggested edit by @kkwli

Author: mjklemm

flang/docs/FlangDriver.md

@@ -213,11 +213,12 @@ and use the `-fno-fortran-main` flag.  This flag removes
 translation units to provide a definition of the `main` function. In this case,
 it may be required to explicitly supply C++ runtime libraries as mentioned above.
 
-When creating shared or static libraries, `Fortran_main` is automatically
-removed from the linker stage.  It is assumed that when creating a static or
-shared library, the generated library does not need a `main` function, as a
-final link stage will occur that will provide the `Fortran_main` library when
-creating the final executable.
+When creating shared or static libraries using Flang with -shared or -static
+flag, Fortran_main is automatically removed from the linker stage (i.e.,
+`-fno-fortran-main` is on by default).  It is assumed that when creating a
+static or shared library, the generated library does not need a `main`
+function, as a final link stage will occur that will provide the `Fortran_main`
+library when creating the final executable.
 
 ## Frontend Driver
 Flang's frontend driver is the main interface between compiler developers and