Polish "Add consistent quotes in YAML samples of reference doc"

See gh-28911

spring-boot-project/spring-boot-docs/src/docs/asciidoc/actuator/endpoints.adoc

@@ -988,21 +988,21 @@ They are also exposed as separate HTTP Probes by using <<actuator#actuator.endpo
 
 You can then configure your Kubernetes infrastructure with the following endpoint information:
 
-[source,yml,indent=0,subs="verbatim"]
+[source,yaml,indent=0,subs="verbatim"]
 ----
-livenessProbe:
-  httpGet:
-    path: /actuator/health/liveness
-    port: <actuator-port>
-  failureThreshold: ...
-  periodSeconds: ...
-
-readinessProbe:
-  httpGet:
-    path: /actuator/health/readiness
-    port: <actuator-port>
-  failureThreshold: ...
-  periodSeconds: ...
+    livenessProbe:
+      httpGet:
+        path: "/actuator/health/liveness"
+        port: <actuator-port>
+      failureThreshold: ...
+      periodSeconds: ...
+
+    readinessProbe:
+      httpGet:
+        path: "/actuator/health/readiness"
+        port: <actuator-port>
+      failureThreshold: ...
+      periodSeconds: ...
 ----
 
 NOTE: `<actuator-port>` should be set to the port that the actuator endpoints are available on.

spring-boot-project/spring-boot-docs/src/docs/asciidoc/deployment/cloud.adoc

@@ -124,12 +124,12 @@ You can configure a sleep execution in a preStop handler to avoid requests being
 This sleep should be long enough for new requests to stop being routed to the pod and its duration will vary from deployment to deployment.
 The preStop handler can be configured by using the PodSpec in the pod's configuration file as follows:
 
-[source,yml,indent=0,subs="verbatim"]
+[source,yaml,indent=0,subs="verbatim"]
 ----
 	spec:
 	  containers:
-	  - name: example-container
-	    image: example-image
+	  - name: "example-container"
+	    image: "example-image"
 	    lifecycle:
 	      preStop:
 	        exec:
@@ -379,26 +379,26 @@ Normally, you put this file in `src/main/appengine`, and it should resemble the
 
 [source,yaml,indent=0,subs="verbatim"]
 ----
-	service: default
+	service: "default"
 
-	runtime: java
-	env: flex
+	runtime: "java"
+	env: "flex"
 
 	runtime_config:
-	  jdk: openjdk8
+	  jdk: "openjdk8"
 
 	handlers:
-	- url: /.*
-	  script: this field is required, but ignored
+	- url: "/.*"
+	  script: "this field is required, but ignored"
 
 	manual_scaling:
 	  instances: 1
 
 	health_check:
-	  enable_health_check: False
+	  enable_health_check: false
 
 	env_variables:
-	  ENCRYPT_KEY: your_encryption_key_here
+	  ENCRYPT_KEY: "your_encryption_key_here"
 ----
 
 You can deploy the app (for example, with a Maven plugin) by adding the project ID to the build configuration, as shown in the following example:

spring-boot-project/spring-boot-docs/src/docs/asciidoc/features/external-config.adoc

@@ -293,18 +293,18 @@ For instance, the two examples below produce the same result:
 ----
 	spring:
 	  config:
-	    import: my.properties
+	    import: "my.properties"
 	my:
-	  property: value
+	  property: "value"
 ----
 
 [source,yaml,indent=0,subs="verbatim",configblocks]
 ----
 	my:
-	  property: value
+	  property: "value"
 	spring:
 	  config:
-	    import: my.properties
+	    import: "my.properties"
 ----
 
 In both of the above examples, the values from the `my.properties` file will take precedence over the file that triggered its import.
@@ -472,14 +472,14 @@ For example, the following file has two logical documents:
 ----
 	spring:
 	  application:
-	    name: MyApp
+	    name: "MyApp"
 	---
 	spring:
 	  application:
-	    name: MyCloudApp
+	    name: "MyCloudApp"
 	  config:
 	    activate:
-	      on-cloud-platform: kubernetes
+	      on-cloud-platform: "kubernetes"
 ----
 
 For `application.properties` files a special `#---` comment is used to mark the document splits:
@@ -528,14 +528,14 @@ For example, the following specifies that the second document is only active whe
 [source,yaml,indent=0,subs="verbatim",configblocks]
 ----
 	myprop:
-	  always-set
+	  "always-set"
 	---
 	spring:
 	  config:
 	    activate:
 	      on-cloud-platform: "kubernetes"
 	      on-profile: "prod | staging"
-	myotherprop: sometimes-set
+	myotherprop: "sometimes-set"
 ----
 
 
@@ -568,11 +568,11 @@ For example, consider the following YAML document:
 ----
 	environments:
 	  dev:
-	    url: https://dev.example.com
-	    name: Developer Setup
+	    url: "https://dev.example.com"
+	    name: "Developer Setup"
 	  prod:
-	    url: https://another.example.com
-	    name: My Cool App
+	    url: "https://another.example.com"
+	    name: "My Cool App"
 ----
 
 In order to access these properties from the `Environment`, they would be flattened as follows:
@@ -593,8 +593,8 @@ For example, consider the following YAML:
 ----
 	 my:
 	  servers:
-	  - dev.example.com
-	  - another.example.com
+	  - "dev.example.com"
+	  - "another.example.com"
 ----
 
 The preceding example would be transformed into these properties:
@@ -789,10 +789,10 @@ This style of configuration works particularly well with the `SpringApplication`
 	  service:
 	    remote-address: 192.168.1.1
 	    security:
-	      username: admin
+	      username: "admin"
 	      roles:
-	      - USER
-	      - ADMIN
+	      - "USER"
+	      - "ADMIN"
 ----
 
 To work with `@ConfigurationProperties` beans, you can inject them in the same way as any other bean, as shown in the following example: