Real-Time Rendering Corrigenda for 2nd edition: minors

Very minor errors (mostly for the authors and the publisher)

• Add "HyperZ" and "Euler-Mascheroni constant" to index.
• Add "polygons, sorting" to the index at appropriate places. (thanks to Adrian Lopez)
• Page 47, last paragraph, 1st line: "represent" should be "represents". (thanks to Robert Moorhead)
• Page 71, end of first paragraph, 2nd to last line, delete the ending ) after "Chapter 6". (thanks to Robert Moorhead)
• Page 112, 2nd full paragraph says "often have a different voltage/luminance response curves", but should say "often have different voltage/luminance curves" (note: removed "a"). (thanks to Robert Moorhead)
• Page 196, 2nd full paragraph, 7th, 9th and 15th line says "BSSRDF function". Remove "function", that's what the "F" in "BSSRDF" stands for. (thanks to Robert Moorhead)
• Page 233, figure 6.25: connecting lines are too thin.
• Page 308, figure 7.15 caption: chance from "Bruch" to "Bruce".
• Page 448, figure 11.9, there is some banding (things go to full white) near the middle of the left edge. Looks a little bad, distracting
• Page 473, figure 11.24, the U and V letters should be bold, not italicized, and should be nicely positioned wrto the vertices they label. (check first edition, and check 11.25 also).
• Page 509, there is no reference in the text to Figure 12.22 (but there is a reference from a caption to this figure). At the end of the second paragraph of section 12.2.5, add a sentence: "An example is shown in Figure 12.22."
• Page 637, figure 14.3, the plane PI lines (solid and dashed) seem a bit thick. Also, they have squared-off endcaps - round endcaps would look better. Finally, the dashed PI line ends with a final dash at the bottom that is very very short - this should be changed.
• Page 640, figure 14.6, again, lines seem thick (compare to 14.7).
• Page 793, reference [633], it should be "SIGGRAPH 2001", and not "SIGGRAPH 2000".
• Plate XIV: change "Example pictures generated by software. Courtesy of NVIDIA Corp." should really change to "Images courtesy of NVIDIA Corp."
• Plates XXII, XXXVIII, and XLIX say "Images courtesy". Should be "Image courtesy", since there's only one image.