Enhance documentation to show that "ro" is the correct way to say "readonly"

in the mode= query parameter.

FossilOrigin-Name: 788b96851d9ced84757c48dc3e0414cab27ee7e50e9730dab30b2e42a7762397

manifest

@@ -1,5 +1,5 @@
-C Add\sthe\s--timer\soption\sto\sfuzzcheck.\s\sGet\sthe\s--timeout\soption\sworking\sin\nfuzzcheck\swhen\srunning\sdbsql\stests.
-D 2020-12-21T12:14:59.759
+C Enhance\sdocumentation\sto\sshow\sthat\s"ro"\sis\sthe\scorrect\sway\sto\ssay\s"readonly"\nin\sthe\smode=\squery\sparameter.
+D 2020-12-21T14:51:33.242
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 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -542,7 +542,7 @@ F src/resolve.c 1948a92ca9eab776632816b97e57c61d933474a78aad4f4ef835c916a83dbb1c
 F src/rowset.c ba9515a922af32abe1f7d39406b9d35730ed65efab9443dc5702693b60854c92
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-F src/sqlite.h.in 5b7593bb0f3658e682a9fcd1cd8fcedf244ec45ca93d645055a53172f55eb783
+F src/sqlite.h.in 0af968a1fa3c717261e1df0ed105fa7bddb4d82de7e0adb3eab49e6aa81b4de7
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 F src/sqliteInt.h 830d395a43449bd9980fa227d60ca20396e7035e5e8ab54be26214fb5379f531
@@ -1893,7 +1893,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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 U drh
-Z b0ca2a90328c04cad0677f000624e900
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manifest.uuid

@@ -1 +1 @@
-3b0c9b41a877c7344ef3b7c5b6981436005716e25b41b1a1ffc145520243abd3
+788b96851d9ced84757c48dc3e0414cab27ee7e50e9730dab30b2e42a7762397

src/sqlite.h.in

@@ -3499,6 +3499,7 @@ void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
 **          that uses dot-files in place of posix advisory locking.
 ** <tr><td> file:data.db?mode=readonly <td> 
 **          An error. "readonly" is not a valid option for the "mode" parameter.
+**          Use "ro" instead:  "file:data.db?mode=ro".
 ** </table>
 **
 ** ^URI hexadecimal escape sequences (%HH) are supported within the path and