Add a single sentence of documentation about the virtual table

scan flags.  No changes to code.

FossilOrigin-Name: 27b4fa5dd0defc6ddaf5d8cde6a1e1162b70d99bfdc69c1d2290621a6d23ed91

manifest

@@ -1,5 +1,5 @@
-C When\sdoing\sa\sone-pass\sUPDATE\sor\sDELETE\son\svirtual\stables,\sclose\sthe\scursor\nprior\sto\srunning\sVUpdate.\s\sThis\sallows\sone-pass\sto\swork\son\svirtual\stables\nthat\sdo\snot\sallow\sconcurrent\sreads\sand\swrites.\s\sEnhance\srtree\sto\stake\nadvantage\sof\sthis\snew\scapability.
-D 2018-05-24T23:51:57.743
+C Add\sa\ssingle\ssentence\sof\sdocumentation\sabout\sthe\svirtual\stable\nscan\sflags.\s\sNo\schanges\sto\scode.
+D 2018-05-26T13:55:04.513
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in bfc40f350586923e0419d2ea4b559c37ec10ee4b6e210e08c14401f8e340f0da
@@ -496,7 +496,7 @@ F src/resolve.c 6415381a0e9d22c0e7cba33ca4a53f81474190862f5d4838190f5eb5b0b47bc9
 F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
 F src/select.c a35d462ee7a3c0856ad7a9d9c8921fbf3d91d911a8f39ad9d61302eb43b24a71
 F src/shell.c.in 51c100206f4b7f86cd9affd80b764825e0edc36ca0190c442e4ca7994611bfe2
-F src/sqlite.h.in e379906b85cc3539c6a37ab972f2c28711b28854a457f54e137d20f75db5db7c
+F src/sqlite.h.in db327b5de56909e060da241ff89cc3726eadf98e9eb17386fc831bbce80e0820
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 9887b27e69c01e79c2cbe74ef73bf01af5b5703d6a7f0a4371e386d7249cb1c7
 F src/sqliteInt.h 5abdade4744cf3bd567afb65bb144bb3c61f6132f86813b995a5ca79c7b584e8
@@ -1729,7 +1729,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 3ba08e53d54165f5541756ad13a4c2f0b18516cb612a256e056ed1ff76c1fa83
-R 52623d992549c096857f92f7f6ff2464
+P b816023ce07d01024d5769e16db924374a49bf909edd12dc1344a0a1ef693db5
+R b15b92c251ddbb4db7b9d545bb44f3e8
 U drh
-Z 92fa856c89ee79b753ba76005690f976
+Z 4edf1dbedf87b8720d2f7ca92e7eba80

manifest.uuid

@@ -1 +1 @@
-b816023ce07d01024d5769e16db924374a49bf909edd12dc1344a0a1ef693db5
+27b4fa5dd0defc6ddaf5d8cde6a1e1162b70d99bfdc69c1d2290621a6d23ed91

src/sqlite.h.in

@@ -6294,6 +6294,10 @@ struct sqlite3_index_info {
 
 /*
 ** CAPI3REF: Virtual Table Scan Flags
+**
+** Virtual table implementations are allowed to set the 
+** [sqlite3_index_info].idxFlags field to some combination of
+** these bits.
 */
 #define SQLITE_INDEX_SCAN_UNIQUE      1     /* Scan visits at most 1 row */