update release docs

Author: adpare

docs/RELEASE.md

@@ -134,7 +134,7 @@ Consult these sections as needed for step 5 in the above list.
     See the release notes [here](https://attack.mitre.org/resources/updates/updates-<month>-<year>/).
   ```
 * Update the `layer_version` and `navigator_version` in `modules/site_config.py` if navigator version or navigator layer version has been updated.<br>
-Check the layer specification version [here](https://github.com/mitre-attack/attack-navigator/blob/master/layers/spec/v4.5/layerformat.md) and the navigator version [here](https://github.com/mitre-attack/attack-navigator/blob/master/CHANGELOG.md).
+Check the layer specification version [here](https://github.com/mitre-attack/attack-navigator/blob/master/layers/spec/) and the navigator version [here](https://github.com/mitre-attack/attack-navigator/blob/master/CHANGELOG.md).
 
 ### Minor release
 
@@ -153,4 +153,4 @@ Check the layer specification version [here](https://github.com/mitre-attack/att
     See detailed changes [here](https://github.com/mitre/cti/releases/tag/ATT%26CK-vX.Y).
   ```
 * Update the `layer_version` and `navigator_version` in `modules/site_config.py` if navigator version or navigator layer version has been updated.<br>
-Check the layer specification version [here](https://github.com/mitre-attack/attack-navigator/blob/master/layers/spec/v4.5/layerformat.md) and the navigator version [here](https://github.com/mitre-attack/attack-navigator/blob/master/CHANGELOG.md).
+Check the layer specification version [here](https://github.com/mitre-attack/attack-navigator/blob/master/layers/spec/) and the navigator version [here](https://github.com/mitre-attack/attack-navigator/blob/master/CHANGELOG.md).