[PATCH v2 0/3] trace2 docs: note that BUG() sends an "error" event

A trivial update to the trace2 docs to fix an omission with "BUG()" not being listed alongside error(), die() etc.

v1 of this[1] added a non-fatal-but-logging bug() function, per the discussion on v1 that's now gone.

1. http://lore.kernel.org/git/cover-0.6-00000000000-20210328T025618Z-avarab@gmail.com

Ævar Arnfjörð Bjarmason (3):
  usage.c: don't copy/paste the same comment three times
  api docs: document BUG() in api-error-handling.txt
  api docs: document that BUG() emits a trace2 error event

 Documentation/technical/api-error-handling.txt | 10 ++++++++--
 Documentation/technical/api-trace2.txt         |  2 +-
 usage.c                                        | 17 +++++------------
 3 files changed, 14 insertions(+), 15 deletions(-)

Range-diff against v1:
1:  a7b329c21cf ! 1:  2e4665b625b usage.c: don't copy/paste the same comment three times
    @@ Metadata
      ## Commit message ##
         usage.c: don't copy/paste the same comment three times
     
    -    In gee4512ed481 (trace2: create new combined trace facility,
    +    In ee4512ed481 (trace2: create new combined trace facility,
         2019-02-22) we started with two copies of this comment,
         0ee10fd1296 (usage: add trace2 entry upon warning(), 2020-11-23) added
         a third. Let's instead add an earlier comment that applies to all
2:  8c8b1dfd184 = 2:  ce78c79c9ac api docs: document BUG() in api-error-handling.txt
3:  f0e0d0daa6e = 3:  982f72345f1 api docs: document that BUG() emits a trace2 error event
4:  515d146cac8 < -:  ----------- usage.c: add a non-fatal bug() function to go with BUG()