add pbkdf2_hi to docs

Signed-off-by: Andrew Thornton <art27@cantab.net>

Author: zeripath

Diff for: docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -568,7 +568,7 @@ Certain queues have defaults that override the defaults set in `[queue]` (this o
 - `IMPORT_LOCAL_PATHS`: **false**: Set to `false` to prevent all users (including admin) from importing local path on server.
 - `INTERNAL_TOKEN`: **\<random at every install if no uri set\>**: Secret used to validate communication within Gitea binary.
 - `INTERNAL_TOKEN_URI`: **<empty>**: Instead of defining INTERNAL_TOKEN in the configuration, this configuration option can be used to give Gitea a path to a file that contains the internal token (example value: `file:/etc/gitea/internal_token`)
-- `PASSWORD_HASH_ALGO`: **pbkdf2**: The hash algorithm to use \[argon2, pbkdf2, pbkdf2_v1, scrypt, bcrypt\], argon2 and scrypt will spend significant amounts of memory.
+- `PASSWORD_HASH_ALGO`: **pbkdf2**: The hash algorithm to use \[argon2, pbkdf2, pbkdf2_v1, pbkdf2_hi, scrypt, bcrypt\], argon2 and scrypt will spend significant amounts of memory.
   - Note: The default parameters for `pbkdf2` hashing have changed - the previous settings are available as `pbkdf2_v1` but are not recommended.
   - The hash functions may be tuned by using `$` after the algorithm:
     - `argon2$<time>$<memory>$<threads>$<key-length>`
@@ -578,9 +578,10 @@ Certain queues have defaults that override the defaults set in `[queue]` (this o
   - The defaults are:
     - `argon2`:    `argon2$2$65536$8$50`
     - `bcrypt`:    `bcrypt$10`
-    - `pbkdf2`:    `pbkdf2$320000$50`
+    - `pbkdf2`:    `pbkdf2$50000$50`
     - `pbkdf2_v1`: `pbkdf2$10000$50`
-    - `pbkdf2_v2`: `pbkdf2$320000$50`
+    - `pbkdf2_v2`: `pbkdf2$50000$50`
+    - `pbkdf2_hi`: `pbkdf2$320000$50`
     - `scrypt`:    `scrypt$65536$16$2$50`
   - Adjusting the algorithm parameters using this functionality is done at your own risk.
 - `CSRF_COOKIE_HTTP_ONLY`: **true**: Set false to allow JavaScript to read CSRF cookie.