Clarify reason for deprecating autotime properties

Closes gh-41745

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -1936,7 +1936,7 @@
       "defaultValue": true,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Requests are timed automatically."
       }
     },
     {
@@ -1944,7 +1944,7 @@
       "description": "Computed non-aggregable percentiles to publish.",
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles."
       }
     },
     {
@@ -1953,7 +1953,7 @@
       "defaultValue": false,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles-histogram."
       }
     },
     {
@@ -1979,7 +1979,7 @@
       "defaultValue": true,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Requests are timed automatically."
       }
     },
     {
@@ -1987,7 +1987,7 @@
       "description": "Computed non-aggregable percentiles to publish.",
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles."
       }
     },
     {
@@ -1996,7 +1996,7 @@
       "defaultValue": false,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles-histogram."
       }
     },
     {
@@ -2029,7 +2029,7 @@
       "defaultValue": true,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Requests are timed automatically."
       }
     },
     {
@@ -2037,7 +2037,7 @@
       "description": "Computed non-aggregable percentiles to publish.",
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles."
       }
     },
     {
@@ -2046,7 +2046,7 @@
       "defaultValue": false,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles-histogram."
       }
     },
     {