Refine documentation for build_always [skip ci]
We mention this is equivalent to setting both build_by_default and
build_always_stale in the release note, and in the warning emitted when it's
used, but not in the reference manual.
@@ -233,9 +233,10 @@ following.
have this target be built by default, that is, when invoking plain
`ninja`; the default value is false
- `build_always` (deprecated) if `true` this target is always considered out of
- date and is rebuilt every time, useful for things such as build
- timestamps or revision control tags.
+ date and is rebuilt every time. Equivalent to setting both
+ `build_always_stale` and `build_by_default` to true.
- `build_always_stale` if `true` the target is always considered out of date.
+ Useful for things such as build timestamps or revision control tags.
The associated command is run even if the outputs are up to date.
- `capture`, there are some compilers that can't be told to write
their output to a file but instead write it to standard output. When
