Improve documentation

Author: invis-z

Documentation/MANPAGE.md

@@ -493,6 +493,21 @@ This option may be specified multiple times, each time it will add two
 arguements `-t` `OPTION` to `fido2-assert`.
 See `man fido2-assert` to check supported options.
 
+Examples:
+
+Creating a filesystem with no pin verification:
+
+    gocryptfs -init -fido2 DEVICE_PATH -fido2-assert-option pin=false CIPHERDIR
+
+Creating a filesystem with both user presence and pin verification:
+
+    gocryptfs -init -fido2 DEVICE_PATH -fido2-assert-option uv=true -fido2-assert-option pin=true CIPHERDIR
+
+Creating a filesystem with both user presence and user verification:
+
+    gocryptfs -init -fido2 DEVICE_PATH -fido2-assert-option up=true -fido2-assert-option uv=true CIPHERDIR
+
+
 #### -masterkey string
 Use an explicit master key specified on the command line or, if the special
 value "stdin" is used, read the masterkey from stdin, instead of reading