More README.md files updated

Some of the files modified include some of the files modified yesterday;
others were not modified yesterday. I backtracked as I noticed some
sections are missing in earlier README.md files. However more have to be
checked in earlier years. I'm committing now as I have to do other
things and am likely done for the day.

1987/hines/README.md

@@ -21,8 +21,8 @@ USA
 
 ### Alternate code
 
-An alternate version of this entry, `hines.alt.c`.
-With older compilers you can try the alt version:
+An alternate version of this entry is in `hines.alt.c`. With older compilers you
+can try the alt version:
 
     make alt