/usr/share/doc-base/ninja is in ninja-build-doc 1.5.1-0.1ubuntu1.
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 6 7 8 | Document: ninja
Title: Ninja Documentation
Author: Gary Kramlich
Section: Programming/C++
Format: HTML
Index: /usr/share/doc/ninja-build-doc/html/index.html
Files: /usr/share/doc/ninja-build-doc/html/*
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