Fix trademark and registered symbol in ack.tex

Author: Linyxus

ack.tex

@@ -1,11 +1,11 @@
 \chapter{附录}
 
 \section{参考文献}
-MIPS® Architecture For Programmers Volume I-A: Introduction to the MIPS32 Architecture.rev3.02
+MIPS\textsuperscript{\textregistered} Architecture For Programmers Volume I-A: Introduction to the MIPS32 Architecture.rev3.02
 
-MIPS® Architecture For Programmers Volume II-A: The MIPS32® Instruction Set 
+MIPS\textsuperscript{\textregistered} Architecture For Programmers Volume II-A: The MIPS32\textsuperscript{\textregistered} Instruction Set 
 
-MIPS® Architecture For Programmers Volume III: The MIPS32® and microMIPS32™ Privileged Resource Architecture 
+MIPS\textsuperscript{\textregistered} Architecture For Programmers Volume III: The MIPS32\textsuperscript{\textregistered} and microMIPS32\textsuperscript{\texttrademark} Privileged Resource Architecture 
 
 Xilinx IP:: AXI Crossbar (2.1) LogiCORE IP Product Guide
 

main.tex

@@ -20,6 +20,7 @@
 \usepackage[T1]{fontenc}
 \usepackage{inconsolata}
 \usepackage{subfig}
+\usepackage{textcomp}
 
 \usepackage{amsmath}
 \usepackage{amssymb}