feat: add kev and epss documentation

Signed-off-by: Nicolas Crocfer <[email protected]>

Author: ncrocfer

docs/guides/advanced_search.md

@@ -53,15 +53,17 @@ The currently supported fields are:
 - **product** - Search by product name (e.g., `android`).
 - **userTag** - Search by user tag associated with the CVE.
 - **project** – Search using the vendors and products subscribed in a project.
+- **kev** – Search based on the KEV catalog. Accepts `true` or `false`.
+- **epss** – Search based on EPSS score. Accepts a percentage (e.g., `epss:80`) or a decimal between 0 and 1 (e.g., `epss:'0.8'`).
 
 !!! important
     Each field supports specific operators to refine your queries effectively:
 
     - **description**, **title**, and **cve** fields support the operators `:` and `=`:
         - `:` performs a partial (LIKE) search.
         - `=` performs an exact match search.
-    - CVSS fields (**cvss20**, **cvss30**, **cvss31**, **cvss40**) support the following comparison operators: `>`, `>=`, `<`, `<=`, `=`.
-    - **vendor**, **product**, and **userTag** fields only support the `:` operator.
+    - Metrics fields (**cvss20**, **cvss30**, **cvss31**, **cvss40**, **epss**) support the following comparison operators: `>`, `>=`, `<`, `<=`, `=`.
+    - **vendor**, **product**, **userTag** and **kev** fields only support the `:` operator.
 
 By using fields and operators, you can fine-tune your searches to quickly find relevant CVEs based on your needs.
 
@@ -101,10 +103,10 @@ To search for CVEs with a high score in either CVSS 3.1 or CVSS 4.0:
 cvss31>=9 OR cvss40>=9
 ```
 
-To search for CVEs within a product:
+To search for CVEs within a product and in the KEV catalog:
 
 ```
-vendor:linux AND product:linux_kernel
+vendor:linux AND product:linux_kernel AND kev:true
 ```
 
 To search all CVE in 1999's:
@@ -113,10 +115,10 @@ To search all CVE in 1999's:
 cve:CVE-1999
 ```
 
-To search all CVEs related to the vendors and products subscribed to in a project:
+To search all CVEs related to the vendors and products subscribed to in a project with a high EPSS score:
 
 ```
-project:my-project
+project:my-project AND epss>=80
 ```
 
 !!! tip