float.h: link to SO question

Author: cirosantilli

README.adoc

@@ -14197,7 +14197,7 @@ https://en.wikipedia.org/wiki/IEEE_754
 Examples:
 
 * link:userland/arch/x86_64/ieee754.S[]
-* link:lkmc/float.h[]
+* link:lkmc/float.h[]. Bibliography: https://stackoverflow.com/questions/52905648/how-to-use-hexadecimal-floating-point-literals-in-gnu-gas/56818851#56818851
 * https://stackoverflow.com/questions/8341395/what-is-a-subnormal-floating-point-number/53203428#53203428
 * https://stackoverflow.com/questions/18118408/what-is-difference-between-quiet-nan-and-signaling-nan/55648118#55648118
 * https://stackoverflow.com/questions/2618059/in-java-what-does-nan-mean/55673220#55673220