remove misleading "in UTC" (#1882)

"seconds since the epoch" (value returned by `time.time()`) doesn't
depend on the local time zone. It is the same time instance around the
world. It is not in any particular time zone:

```python
import datetime as DT
import zoneinfo

local_time = DT.datetime.fromtimestamp(seconds_since_epoch)    # naive datetime object representing local time
utc_time = DT.datetime.utcfromtimestamp(seconds_since_epoch)  # naive datetime object representing utc time
la_time = DT.datetime.fromtimestamp(seconds_since_epoch, zoneinfo.ZoneInfo("America/Los_Angeles"))   # timezone aware dt
```

Here `local_time`, `utc_time`, `la_time` may correspond to different
clock times but it is exactly the same time instance.

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/index.rst b/docs/index.rst
index 46795150..a99ab206 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -1180,7 +1180,7 @@ Process class
   .. method:: create_time()
 
     The process creation time as a floating point number expressed in seconds
-    since the epoch, in UTC. The return value is cached after first call.
+    since the epoch. The return value is cached after first call.
 
       >>> import psutil, datetime
       >>> p = psutil.Process()