Add comment that xcode version needs to be updated in two places

Bug: None
Change-Id: I6876c06079a06241fe8756941f1822d99c15fdcc
Reviewed-on: https://webrtc-review.googlesource.com/c/104483
Commit-Queue: Oleh Prypin <oprypin@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25051}

tools_webrtc/ios/client.webrtc/iOS32_Debug.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Builder for 32-bit devices."
+    "Builder for 32-bit devices.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/client.webrtc/iOS32_Release.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Builder for 32-bit devices."
+    "Builder for 32-bit devices.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/client.webrtc/iOS32_Sim_Debug_(iOS_9.0).json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Tests for 32-bit iOS simulators."
+    "Tests for 32-bit iOS simulators.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/client.webrtc/iOS64_Debug.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Builder for 64-bit devices."
+    "Builder for 64-bit devices.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/client.webrtc/iOS64_Release.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Builder for 64-bit devices."
+    "Builder for 64-bit devices.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/client.webrtc/iOS64_Sim_Debug_(iOS_10.0).json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Tests for 64-bit iOS simulators."
+    "Tests for 64-bit iOS simulators.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/client.webrtc/iOS64_Sim_Debug_(iOS_11.0).json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Tests for 64-bit iOS simulators."
+    "Tests for 64-bit iOS simulators.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/client.webrtc/iOS64_Sim_Debug_(iOS_9.0).json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Tests for 64-bit iOS simulators."
+    "Tests for 64-bit iOS simulators.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/tryserver.webrtc/ios32_sim_ios9_dbg.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Tests for 32-bit iOS simulators."
+    "Tests for 32-bit iOS simulators.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios10_dbg.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Tests for 64-bit iOS simulators."
+    "Tests for 64-bit iOS simulators.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios11_dbg.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Tests for 64-bit iOS simulators."
+    "Tests for 64-bit iOS simulators.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios9_dbg.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Tests for 64-bit iOS simulators."
+    "Tests for 64-bit iOS simulators.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/tryserver.webrtc/ios_arm64_dbg.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Builder for 64-bit devices."
+    "Builder for 64-bit devices.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/tryserver.webrtc/ios_arm64_rel.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Builder for 64-bit devices."
+    "Builder for 64-bit devices.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/tryserver.webrtc/ios_dbg.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Builder for 32-bit devices."
+    "Builder for 32-bit devices.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [

tools_webrtc/ios/tryserver.webrtc/ios_rel.json

@@ -1,6 +1,7 @@
 {
   "comments": [
-    "Builder for 32-bit devices."
+    "Builder for 32-bit devices.",
+    "NOTE: Update cache entry in cr-buildbucket.cfg when changing xcode version."
   ],
   "xcode build version": "10l232m",
   "gn_args": [