Changed multi-line C comments into another style.

The left side doesn't look unbalanced.

src/common/hlldbgsym.h

@@ -34,10 +34,10 @@
 
 
 /* This module contains definitions for high level language symbols passed
- * down from the C compiler. They're collected in the assembler and written to
- * the object file in binary form, then again read by the linker and finally
- * placed in the debug info file.
- */
+** down from the C compiler. They're collected in the assembler and written to
+** the object file in binary form, then again read by the linker and finally
+** placed in the debug info file.
+*/