SPReD: doc: Sprites Manipulation: added tip about optimization of packed data

Author: 0x8BitDev

doc/SPReD/Quick_Guide.html

@@ -227,6 +227,7 @@
 some cases you may need to pack all your sprites data into a set of
 1-32 KB. Select sprites, select data block size and click the “Packing”
 button.</SPAN></FONT></P>
+<P LANG="en-US" STYLE="text-indent: 1cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>Tip: </B>To reduce the number of duplicate CHRs after the packing operation, you can apply the optimization operation to the packed data.</FONT></P>
 <P LANG="en-US" STYLE="text-indent: 1cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>Splitting</B></FONT></P>
 <P LANG="en-US" STYLE="text-indent: 1cm; margin-bottom: 0cm; font-weight: normal">
 <FONT FACE="Arial, sans-serif">This is a backward operation for the