Issue 17509 (#17511)

Updates KV docs to clarify that only exact matches of `.` and `..` are prohibited in keys.

Signed-off-by: Rob Sutter <[email protected]>

Author: rts-rob

src/content/docs/kv/api/write-key-value-pairs.mdx

@@ -48,7 +48,7 @@ env.NAMESPACE.put(key, value, options?);
 #### Parameters
 
 - `key`: `string`
-  - The key to associate with the value. A key cannot be empty, have a `.` or `..`. All other keys are valid. Keys have a maximum length of 512 bytes.
+  - The key to associate with the value. A key cannot be empty or be exactly equal to `.` or `..`. All other keys are valid. Keys have a maximum length of 512 bytes.
 - `value`: `string` | `ReadableStream` | `ArrayBuffer`
 
   - The value to store. The type is inferred. The maximum size of a value is 25 MiB.