Correct typos in lockup-watchdogs.rst.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
---
v2: corrections from Björn (Thanks)

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: linux-doc@vger.kernel.org
Cc: Björn Persson <Bjorn@xn--rombobjrn-67a.se>

 Documentation/admin-guide/lockup-watchdogs.rst |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-next-20260406.orig/Documentation/admin-guide/lockup-watchdogs.rst
+++ linux-next-20260406/Documentation/admin-guide/lockup-watchdogs.rst
@@ -41,7 +41,7 @@ is a trade-off between fast response to
 Implementation
 ==============
 
-The soft and hard lockup detectors are built around a hrtimer.
+The soft and hard lockup detectors are built around an hrtimer.
 In addition, the softlockup detector regularly schedules a job, and
 the hard lockup detector might use Perf/NMI events on architectures
 that support it.
@@ -49,7 +49,7 @@ that support it.
 Frequency and Heartbeats
 ------------------------
 
-The core of the detectors in a hrtimer. It servers multiple purpose:
+The core of the detectors is an hrtimer. It serves multiple purposes:
 
 - schedules watchdog job for the softlockup detector
 - bumps the interrupt counter for hardlockup detectors (heartbeat)