[PATCHv2 6/7] doc: storage: Explicitly state that it's possible to have non-unique key

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With most of our storage backends it's possible to have two separate
volume keys to point to a single volume. (By creating sym/hard-links to
local files or by mounting remote filesystems to two different locations
and creating pools on top of them) Document this possibility.
---
 docs/formatstorage.html.in | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/docs/formatstorage.html.in b/docs/formatstorage.html.in
index a089a31..1cd82b4 100644
--- a/docs/formatstorage.html.in
+++ b/docs/formatstorage.html.in
@@ -311,8 +311,10 @@
       <dd>Providing a name for the volume which is unique to the pool.
         This is mandatory when defining a volume.  <span class="since">Since 0.4.1</span></dd>
       <dt><code>key</code></dt>
-      <dd>Providing an identifier for the volume which is globally unique.
-          This cannot be set when creating a volume: it is always generated.
+      <dd>Providing an identifier for the volume which identifies a
+          single volume. In some cases it's possible to have two distinct keys
+          identifying a single volume. This field cannot be set when creating
+          a volume: it is always generated.
         <span class="since">Since 0.4.1</span></dd>
       <dt><code>allocation</code></dt>
       <dd>Providing the total storage allocation for the volume. This
-- 
1.9.0

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