[doc] Install gcc-c++ on Fedora

Replace yum with dnf
Fix markdown
8 jobs for !1390 with 1426_allow_wider_node_vers in 17 minutes and 43 seconds (queued for 7 seconds)
detached
Status Job ID Name Coverage
  Tests
passed #53863
redshift
tests

00:15:54

69.34%
failed #53856
redshift
tests

01:00:08

 
  Package
manual #53858
redshift allowed to fail manual
package:test:docker-test-image
manual #53857
redshift allowed to fail manual
releases:test
 
  Quality
passed #53860
redshift
audit_dependencies

00:01:47

failed #53859
redshift
fmt_and_clippy

00:01:46

 
  Integration
skipped #53861
redshift allowed to fail manual
sync_g1
skipped #53862
redshift allowed to fail manual
sync_gtest
 
Name Stage Failure
failed
fmt_and_clippy Quality
         let max_node_vers: version_compare::Version = Version::from(MAX_NODE_VERSION).unwrap();
- if node_vers_cut < min_node_vers || max_node_vers <= node_vers_cut
- {
+ if node_vers_cut < min_node_vers || max_node_vers <= node_vers_cut {
eprintln!(
"Duniter requires node between v{} and v{}. Please install a correct node version (you can use nvm). Current version {}",
MIN_NODE_VERSION, MAX_NODE_VERSION, node_vers
Cleaning up file based variables
ERROR: Job failed: exit code 1