[Chapel Merge] Fix names of `c_ssize_t` and `c_size_t` in extern technote

Branch: refs/heads/main
Revision: 445e8a6d8fa7cec22b5e704bc77462d8791f2d4e
Author: arifthpe
Link: Fix names of `c_ssize_t` and `c_size_t` in extern technote by arifthpe · Pull Request #27229 · chapel-lang/chapel · GitHub
Log Message:
Fix names of c_ssize_t and c_size_t in extern technote (#27229)

Fix the names of the c_ssize_t and c_size_t symbols in the extern
technote, which were missing their c_ prefix.

These prefixes were added in
Add `c_` prefix to Chapel's `size_t` and `ssize_t` types by bradcray · Pull Request #19284 · chapel-lang/chapel · GitHub.

[reviewed by @bradcray, thanks!]

Compare: Comparing a45af4e5eb4dd23fc23839d3598fa85ac985a919...40717a8f8fe9569f921c555d33f1a147302f628b · chapel-lang/chapel · GitHub

Diff:
M doc/rst/technotes/extern.rst
https://github.com/chapel-lang/chapel/pull/27229.diff