Fix code syntax highlighting in docs (#5245)

* Added yaml to undelcared code blocks
* Changed YAML->yaml for consistency
* Added console syntax highlighting

Signed-off-by: Dean Coakley <dean.s.coakley@gmail.com>

docs/chart_template_guide/control_structures.md

@@ -20,7 +20,7 @@ The first control structure we'll look at is for conditionally including blocks
 
 The basic structure for a conditional looks like this:
 
-```
+```yaml
 {{ if PIPELINE }}
   # Do something
 {{ else if OTHER PIPELINE }}
@@ -115,7 +115,7 @@ data:
 
 `mug` is incorrectly indented. Let's simply out-dent that one line, and re-run:
 
-```
+```yaml
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -224,7 +224,7 @@ The next control structure to look at is the `with` action. This controls variab
 
 The syntax for `with` is similar to a simple `if` statement:
 
-```
+```yaml
 {{ with PIPELINE }}
   # restricted scope
 {{ end }}

docs/chart_template_guide/debugging.md

@@ -12,7 +12,7 @@ When your YAML is failing to parse, but you want to see what is generated, one
 easy way to retrieve the YAML is to comment out the problem section in the template,
 and then re-run `helm install --dry-run --debug`:
 
-```YAML
+```yaml
 apiVersion: v1
 # some: problem section
 # {{ .Values.foo | quote }}
@@ -20,7 +20,7 @@ apiVersion: v1
 
 The above will be rendered and returned with the comments intact:
 
-```YAML
+```yaml
 apiVersion: v1
 # some: problem section
 #  "bar"

docs/chart_template_guide/functions_and_pipelines.md

@@ -4,7 +4,7 @@ So far, we've seen how to place information into a template. But that informatio
 
 Let's start with a best practice: When injecting strings from the `.Values` object into the template, we ought to quote these strings. We can do that by calling the `quote` function in the template directive:
 
-```
+```yaml
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -104,7 +104,7 @@ drink: {{ .Values.favorite.drink | default "tea" | quote }}
 
 If we run this as normal, we'll get our `coffee`:
 
-```
+```yaml
 # Source: mychart/templates/configmap.yaml
 apiVersion: v1
 kind: ConfigMap

docs/chart_template_guide/values_files.md

@@ -54,7 +54,7 @@ data:
 
 Because `favoriteDrink` is set in the default `values.yaml` file to `coffee`, that's the value displayed in the template. We can easily override that by adding a `--set` flag in our call to `helm install`:
 
-```
+```console
 helm install --dry-run --debug --set favoriteDrink=slurm ./mychart
 SERVER: "localhost:44134"
 CHART PATH: /Users/mattbutcher/Code/Go/src/k8s.io/helm/_scratch/mychart
@@ -85,7 +85,7 @@ favorite:
 
 Now we would have to modify the template slightly:
 
-```
+```yaml
 apiVersion: v1
 kind: ConfigMap
 metadata:

docs/chart_template_guide/yaml_techniques.md

@@ -177,7 +177,7 @@ Now the value of `coffee` will be `Latte\nCappuccino\nEspresso\n\n\n`.
 Indentation inside of a text block is preserved, and results in the preservation
 of line breaks, too:
 
-```
+```yaml
 coffee: |-
   Latte
     12 oz
@@ -336,7 +336,7 @@ reference is expanded and then discarded.
 So if we were to decode and then re-encode the example above, the resulting
 YAML would be:
 
-```YAML
+```yaml
 coffee: yes, please
 favorite: Cappucino
 coffees: