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9d170a493e
Without the groupings, only the first alternation matches the diff
marker. For example,
local na_doc='todo\.txt\|version\d\.txt\|tags'
... +'g^diff --git a/runtime/doc/'${na_doc}'...
becomes, after expansion,
... +'g^diff --git a/runtime/doc/todo\.txt\|version\d\.txt\|tags'...
so the matches become "^diff --get a/runtime/doc/todo\.txt",
"version\d\.txt", or "tags". Adding the grouping ensures the expected
behavior of requiring "^diff --get a/runtime/doc/" before every
filename.