Correct version that recaptcha_{private,public}_key_path config options were introduced (#18684)

Introduced in https://github.com/element-hq/synapse/pull/17984

I already see a
[`v1.134.0rc1`](https://github.com/element-hq/synapse/releases/tag/v1.134.0rc1)
tag from 5 days ago so I assume
https://github.com/element-hq/synapse/pull/17984 will actually ship in
the next release (which will be `v1.135.0`)

changelog.d/18684.feature

@@ -0,0 +1 @@
+Add `recaptcha_private_key_path` and `recaptcha_public_key_path` config option.

docs/usage/configuration/config_documentation.md

@@ -2363,7 +2363,7 @@ recaptcha_public_key: YOUR_PUBLIC_KEY
 
 The file should be a plain text file, containing only the public key. Synapse reads the public key from the given file once at startup.
 
-_Added in Synapse 1.134.0._
+_Added in Synapse 1.135.0._
 
 Defaults to `null`.
 
@@ -2387,7 +2387,7 @@ recaptcha_private_key: YOUR_PRIVATE_KEY
 
 The file should be a plain text file, containing only the private key. Synapse reads the private key from the given file once at startup.
 
-_Added in Synapse 1.134.0._
+_Added in Synapse 1.135.0._
 
 Defaults to `null`.
 

schema/synapse-config.schema.yaml

@@ -2703,7 +2703,7 @@ properties:
       Synapse reads the public key from the given file once at startup.
 
 
-      _Added in Synapse 1.134.0._
+      _Added in Synapse 1.135.0._
     default: null
     examples:
       - /path/to/key/file
@@ -2726,7 +2726,7 @@ properties:
       Synapse reads the private key from the given file once at startup.
 
 
-      _Added in Synapse 1.134.0._
+      _Added in Synapse 1.135.0._
     default: null
     examples:
       - /path/to/key/file