docs: clarify that sessions use cache by default (#44576)

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Niklas Wenzel <[email protected]>

docs/api/session.md

@@ -27,7 +27,8 @@ The `session` module has the following methods:
 
 * `partition` string
 * `options` Object (optional)
-  * `cache` boolean - Whether to enable cache.
+  * `cache` boolean - Whether to enable cache. Default is `true` unless the
+    [`--disable-http-cache` switch](command-line-switches.md#--disable-http-cache) is used.
 
 Returns `Session` - A session instance from `partition` string. When there is an existing
 `Session` with the same `partition`, it will be returned; otherwise a new
@@ -46,7 +47,8 @@ of an existing `Session` object.
 
 * `path` string
 * `options` Object (optional)
-  * `cache` boolean - Whether to enable cache.
+  * `cache` boolean - Whether to enable cache. Default is `true` unless the
+    [`--disable-http-cache` switch](command-line-switches.md#--disable-http-cache) is used.
 
 Returns `Session` - A session instance from the absolute path as specified by the `path`
 string. When there is an existing `Session` with the same absolute path, it