Many small harmless comment changes. Removal of obsolete comments and

fixing misspelled words.  No changes to code.

FossilOrigin-Name: a0d5cc9315dc6e9ef7dee4c3dfabf4e562d64376

src/printf.c

@@ -413,13 +413,7 @@ void sqlite3VXPrintf(
           else                         prefix = 0;
         }
         if( xtype==etGENERIC && precision>0 ) precision--;
-#if 0
-        /* Rounding works like BSD when the constant 0.4999 is used.  Wierd! */
-        for(idx=precision, rounder=0.4999; idx>0; idx--, rounder*=0.1);
-#else
-        /* It makes more sense to use 0.5 */
         for(idx=precision, rounder=0.5; idx>0; idx--, rounder*=0.1){}
-#endif
         if( xtype==etFLOAT ) realvalue += rounder;
         /* Normalize realvalue to within 10.0 > realvalue >= 1.0 */
         exp = 0;