Code block lexer of http does not work, use text instead

Author: stevepiercy

docs/deployment/caching/enable.md

@@ -19,6 +19,8 @@ Even though cache support is available in Plone, it is **not enabled by default*
 It is highly recommended to configure caching for every new Plone site in production.
 
 
+(enable-caching-label)=
+
 ## Enable caching
 
 Enabling of caching is currently only supported in the Classic UI.

docs/deployment/caching/rulesets-and-caching-operations.md

@@ -75,7 +75,7 @@ Only use this operation for stable resources that never change without changing
 
 In the caching profiles `without-caching-proxy` and `with-caching-proxy`, this operation is mapped to the rulesets `plone.resource` and `plone.stableResource`, which causes the following headers to be added to the response:
 
-```http
+```text
 Last-Modified: <last-modified-date>
 Cache-Control: max-age=<seconds>, proxy-revalidate, public
 ```
@@ -97,14 +97,14 @@ In the caching profile `with-caching-proxy`, this operation is mapped to the rul
 
 #### `plone.content.feed`
 
-```http
+```text
 ETag: <etag-value>
 Cache-Control: max-age=0, s-maxage=<seconds>, must-revalidate
 ```
 
 #### `plone.content.file`
 
-```http
+```text
 Last-Modified: <last-modified-date>
 Cache-Control: max-age=0, s-maxage=<seconds>, must-revalidate
 ```
@@ -120,14 +120,14 @@ In the caching profile `without-caching-proxy`, this operation is mapped to the
 
 #### `plone.content.itemView`, `plone.content.folderView`, `plone.content.feed`
 
-```http
+```text
 ETag: <etag-value>
 Cache-Control: max-age=0, must-revalidate, private
 ```
 
 ### plone.content.file
 
-```http
+```text
 Last-Modified: <last-modified-date>
 Cache-Control: max-age=0, must-revalidate, private
 ```