Restore meaningful comments in some manifests

index/si/si_units/si_units-0.1.0.toml

@@ -9,7 +9,7 @@ project-files = ["si_units_lib.gpr"]
 tags = ["utilities", "formatting"]
 [available."case(distribution)"]
 "..." = true
-debian = false
+debian = false # Compilation hangs on this system (debian-stable)
 
 [gpr-externals]
 BUILD = ["debug", "release"]

index/te/templates_parser/templates_parser-17.2.0.toml

@@ -22,6 +22,7 @@ TP_XMLADA = ["Installed", "Disabled"]
 
 [gpr-set-externals]
 TP_XMLADA = "Installed"
+# We configure it with external xmlada, so other projects depending on xmlada do not clash
 
 [origin]
 url = "https://github.com/AdaCore/templates-parser/archive/17.2.tar.gz"