Fix: revise obsolete command in README.md

The obsolete command `make bench` was replaced by `make short_bench` and `make long_bench` in 2015.
However, this command wasn't revised in README, so I follow the previous commit and rewrite it.

Signed-off-by: Shao-Tse Hung <ccs100203 at gmail.com>
---
 README.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

----- On Aug 2, 2022, at 1:44 PM, Shao-Tse Hung via lttng-dev lttng-dev at lists.lttng.org wrote:

> The obsolete command `make bench` was replaced by `make short_bench` and `make
> long_bench` in 2015.
> However, this command wasn't revised in README, so I follow the previous commit
> and rewrite it.

Merged into liburcu master, 0.13, 0.12 branches, thanks!

Mathieu

> 
> Signed-off-by: Shao-Tse Hung <ccs100203 at gmail.com>
> ---
> README.md | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/README.md b/README.md
> index a8318c8..1e75589 100644
> --- a/README.md
> +++ b/README.md
> @@ -426,14 +426,15 @@ Make targets
> ------------
> 
> In addition to the usual `make check` target, Userspace RCU features
> -`make regtest` and `make bench` targets:
> +`make regtest`, `make short_bench` and `make long_bench` targets:
> 
>   - `make check`: short tests, meant to be run when rebuilding or
>     porting Userspace RCU.
>   - `make regtest`: long (many hours) test, meant to be run when
>     modifying Userspace RCU or porting it to a new architecture or
>     operating system.
> -  - `make bench`: long (many hours) benchmarks.
> +  - `make short_bench`: short benchmarks, 3 seconds per test.
> +  - `make long_bench`: long (many hours) benchmarks, 30 seconds per test.
> 
> 
> Known issues
> --
> 2.25.1
> 
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