[PATCH 1/2] doc/s6-rc-compile.html: document bundle flattening

[Adam Joseph <adam@westernsemico.com>]

This commit adds a single sentence explaining that nested bundles
are flattened by s6-rc-compile; the fact that one bundle contains
another (rather than merely happening to contain all the atomics
that the latter contains) is not preserved by s6-rc-compile.

Although this is the most reasonable handling it is not the only
possible handling.  I had to read the source code in order to make
sure that bundle nesting was not represented in the output of
s6-rc-compile, and figured that adding a mention of this fact to the
documentation might save others the trouble.

More importantly, the special rules for singleton bundles (see next
patch in series) depend on this flattening behavior.

Signed-off-by: Adam Joseph <adam@westernsemico.com>
---
 doc/s6-rc-compile.html | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/s6-rc-compile.html b/doc/s6-rc-compile.html
index e1ad82b..ef06893 100644
--- a/doc/s6-rc-compile.html
+++ b/doc/s6-rc-compile.html
@@ -136,6 +136,9 @@ deprecated. </li>
 <tt>contents</tt> file.
 However, if s6-rc-compile detects a cycle in bundle definitions, it will
 complain and exit 1.
+Bundles are flattened during compilation: a parent bundle which
+contains a child bundle will be compiled as if the parent bundle had
+directly included the child bundle's contents.
 </p>
 
 <h3> For atomic services </h3>
-- 
2.41.0