Fix Missed Renamed OpenBMCManager word

The commit fc1cdd14 misses a word change from OemManager to
OpenBMCManager in meson.options.

Tested: Inspection only

Change-Id: I9fd1da737656ffe5136bd9298f35a0dc527d4870
Signed-off-by: Myung Bae <myungbae@us.ibm.com>
diff --git a/meson.options b/meson.options
index bbca68a..b80a666 100644
--- a/meson.options
+++ b/meson.options
@@ -266,7 +266,7 @@
     value: 'enabled',
     description: '''Enables Redfish OEM fan data on the manager resource.
                     This includes PID and Stepwise controller data. See
-                    OemManager schema for more detail.''',
+                    OpenBMCManager schema for more detail.''',
 )
 
 option(