/usr/src/gcc-4.8/debian/patches/svn-doc-updates.diff is in gcc-4.8-source 4.8.5-4ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # DP: updates from the 4.8 branch upto 20140404 (documentation).
svn diff svn://gcc.gnu.org/svn/gcc/tags/gcc_4_8_5_release svn://gcc.gnu.org/svn/gcc/branches/gcc-4_8-branch \
| sed -r 's,^--- (\S+)\t(\S+)(.*)$,--- a/src/\1\t\2,;s,^\+\+\+ (\S+)\t(\S+)(.*)$,+++ b/src/\1\t\2,' \
| awk '/^Index:.*\.texi/ {skip=0; print; next} /^Index:/ {skip=1; next} skip==0'
|