Add a VDBE synopsis comment for clarification.

FossilOrigin-Name: 029a6dc744c24e7be482298c678af8a115d6a87b

manifest

@@ -1,5 +1,5 @@
-C Add\sa\smissing\sticket\snumber\sto\sa\scomment\sin\sindex7.test.
-D 2014-08-27T17:48:15.250
+C Add\sa\sVDBE\ssynopsis\scomment\sfor\sclarification.
+D 2014-08-27T17:53:40.315
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 5eb79e334a5de69c87740edd56af6527dd219308
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -284,7 +284,7 @@ F src/update.c ea336ce7b8b3fc5e316ba8f082e6445babf81059
 F src/utf.c 77abb5e6d27f3d236e50f7c8fff1d00e15262359
 F src/util.c 068dcd26354a3898ccc64ad5c4bdb95a7a15d33a
 F src/vacuum.c 3728d74919d4fb1356f9e9a13e27773db60b7179
-F src/vdbe.c 8b6638420347e01f7be6c276726441579a407be0
+F src/vdbe.c fd193824d1cc4a71c631eb792ce837aab530210a
 F src/vdbe.h c63fad052c9e7388d551e556e119c0bcf6bebdf8
 F src/vdbeInt.h 4653bb420abb7acdc215659cdcedd3a59f336191
 F src/vdbeapi.c 09677a53dd8c71bcd670b0bd073bb9aefa02b441
@@ -1188,7 +1188,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P fcebca166f15431764b82a8b267f11d28386e975
-R 37c899ad123d2de7fd7d4d94d2ae021b
-U dan
-Z ddd6cebe79a234ecfb1f478d7979e62b
+P d8b1c4336145d436241863c3525530e24a24799b
+R 34521287dadc9603bb93e0f806afdcf3
+U mistachkin
+Z d8914cdf39bc88ab4bc7c63f9115cf85

manifest.uuid

@@ -1 +1 @@
-d8b1c4336145d436241863c3525530e24a24799b
+029a6dc744c24e7be482298c678af8a115d6a87b

src/vdbe.c

@@ -1740,6 +1740,7 @@ case OP_RealAffinity: {                  /* in1 */
 
 #ifndef SQLITE_OMIT_CAST
 /* Opcode: Cast P1 P2 * * *
+** Synopsis: affinity(r[P1])
 **
 ** Force the value in register P1 to be the type defined by P2.
 **