/usr/share/doc/libcommons-lang3-java/api/org/apache/commons/lang3/mutable/class-use/ is in libcommons-lang3-java-doc 3.5-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libcommons-lang3-java/api/org/apache/commons/lang3/mutable/class-use/Mutable.html
/usr/share/doc/libcommons-lang3-java/api/org/apache/commons/lang3/mutable/class-use/MutableBoolean.html
/usr/share/doc/libcommons-lang3-java/api/org/apache/commons/lang3/mutable/class-use/MutableByte.html
/usr/share/doc/libcommons-lang3-java/api/org/apache/commons/lang3/mutable/class-use/MutableDouble.html
/usr/share/doc/libcommons-lang3-java/api/org/apache/commons/lang3/mutable/class-use/MutableFloat.html
/usr/share/doc/libcommons-lang3-java/api/org/apache/commons/lang3/mutable/class-use/MutableInt.html
/usr/share/doc/libcommons-lang3-java/api/org/apache/commons/lang3/mutable/class-use/MutableLong.html
/usr/share/doc/libcommons-lang3-java/api/org/apache/commons/lang3/mutable/class-use/MutableObject.html
/usr/share/doc/libcommons-lang3-java/api/org/apache/commons/lang3/mutable/class-use/MutableShort.html