check-health: wording: load -> utilization

The load is defined as something different...

https://en.wikipedia.org/wiki/Load_(computing)

So let's update the wording and use 'utilization' instead.

---- ✂️ ----
🧮️📈️ Health warning: CPU utilization

The average CPU utilization on MikroTik is at 76%!
---- ✂️ ----
🧮️📉️ Health recovery: CPU utilization

The average CPU utilization on MikroTik decreased to 64%.
---- ✂️ ----

5 files changed, 7 insertions, 7 deletions

diff --git a/doc/check-health.d/notification-01-cpu-load-high.avif b/doc/check-health.d/notification-01-cpu-load-high.avif
deleted file mode 100644
index 3c1a468..0000000
--- a/doc/check-health.d/notification-01-cpu-load-high.avif
+++ /dev/null
diff --git a/doc/check-health.d/notification-01-cpu-utilization-high.avif b/doc/check-health.d/notification-01-cpu-utilization-high.avif
new file mode 100644
index 0000000..8aad878
--- /dev/null
+++ b/doc/check-health.d/notification-01-cpu-utilization-high.avif
diff --git a/doc/check-health.d/notification-02-cpu-load-ok.avif b/doc/check-health.d/notification-02-cpu-load-ok.avif
deleted file mode 100644
index 4f12b70..0000000
--- a/doc/check-health.d/notification-02-cpu-load-ok.avif
+++ /dev/null
diff --git a/doc/check-health.d/notification-02-cpu-utilization-ok.avif b/doc/check-health.d/notification-02-cpu-utilization-ok.avif
new file mode 100644
index 0000000..ee5d7d0
--- /dev/null
+++ b/doc/check-health.d/notification-02-cpu-utilization-ok.avif
diff --git a/doc/check-health.md b/doc/check-health.md
index 850d61c..58c1fba 100644
--- a/doc/check-health.md
+++ b/doc/check-health.md
@@ -12,7 +12,7 @@ Description
 This script is run from scheduler periodically, sending notification on
 health related events:
 
-* high CPU load
+* high CPU utilization
 * low available free RAM
 * voltage jumps up or down more than configured threshold
 * voltage drops below hard lower limit
@@ -21,18 +21,18 @@ health related events:
 
 Note that bad initial state will not trigger an event.
 
-Monitoring CPU load and available free RAM works on all devices. Other
-than that only sensors available in hardware can be checked. See what your
-hardware supports:
+Monitoring CPU utilization and available free RAM works on all devices.
+Other than that only sensors available in hardware can be checked. See what
+your hardware supports:
 
     /system/health/print;
 
 ### Sample notifications
 
-#### CPU load
+#### CPU utilization
 
-![check-health notification cpu load high](check-health.d/notification-01-cpu-load-high.avif)  
-![check-health notification cpu load ok](check-health.d/notification-02-cpu-load-ok.avif)
+![check-health notification cpu utilization high](check-health.d/notification-01-cpu-utilization-high.avif)  
+![check-health notification cpu utilization ok](check-health.d/notification-02-cpu-utilization-ok.avif)
 
 #### Available free RAM