Corrected heading in chart tutorial and associated table of contents entries.
Corrected heading in chart tutorial and associated table of contents entries.

sguan-actuate/birt,rrimmana/birt-1,Charling-Huang/birt,Charling-Huang/birt,Charling-Huang/birt,rrimmana/birt-1,sguan-actuate/birt,rrimmana/birt-1,sguan-actuate/birt,rrimmana/birt-1,sguan-actuate/birt,Charling-Huang/birt,sguan-actuate/birt,Charling-Huang/birt,rrimmana/birt-1