[Integrated] [foreign-jextract] RFR: 8243485: adjust panama_jextract.md samples after recent foreign-abi changes

[Athijegannathan Sundararajan]

Changeset: ee6865e3
Author:    Athijegannathan Sundararajan <sundar at openjdk.org>
Date:      2020-04-23 16:57:16 +0000
URL:       https://git.openjdk.java.net/panama-foreign/commit/ee6865e3

8243485: adjust panama_jextract.md samples after recent foreign-abi changes

Reviewed-by: henryjen

! doc/panama_jextract.html
! doc/panama_jextract.md