build: fix wrong man page paths

Change the old .txt paths into the new .in paths.

This amends commit 76bd5ad0f ("build: simplify code related to man
pages", 2023-07-12) / PR #5898.

.github/workflows/build-extra.yml

@@ -7,7 +7,7 @@ on:
       - 'contrib/syntax/**'
       - 'contrib/vim/**'
       - 'etc/**'
-      - 'src/man/*.txt'
+      - 'src/man/*.in'
       - .git-blame-ignore-revs
       - .github/dependabot.yml
       - .github/pull_request_template.md
@@ -29,7 +29,7 @@ on:
       - 'contrib/syntax/**'
       - 'contrib/vim/**'
       - 'etc/**'
-      - 'src/man/*.txt'
+      - 'src/man/*.in'
       - .git-blame-ignore-revs
       - .github/dependabot.yml
       - .github/pull_request_template.md

src/firejail/util.c

@@ -1474,7 +1474,7 @@ int ascii_isxdigit(unsigned char c) {
 	return ret;
 }
 
-// Note: Keep this in sync with NAME VALIDATION in src/man/firejail.txt.
+// Note: Keep this in sync with NAME VALIDATION in src/man/firejail.1.in.
 //
 // Allow only ASCII letters, digits and a few special characters; names with
 // only numbers are rejected; spaces and control characters are rejected.