Cut the importer's rationale, pin the name selection the docs show, and spell the PRI alike

README.md

@@ -192,7 +192,7 @@ for an ASCII one, which selects the row too, so `misc.tld[.рф]` renders `.xn--
 draw spans the whole zone, `.arpa` and `.zuerich` alike, so pin `misc.tld[.com]` where
 a fixture needs one a reader recognises.
 `misc.loglevel` is RFC 5424's eight severities, keyed by the numerical code a syslog
-PRI carries and named by the severity, so `misc.loglevel[3]` and `misc.loglevel[Error]`
+PRI encodes and named by the severity, so `misc.loglevel[3]` and `misc.loglevel[Error]`
 are one row and `misc.loglevel.code` the number beside the name.
 [`DATA-LICENSES.md`](DATA-LICENSES.md) names each table's source and licence.
 
@@ -1234,7 +1234,7 @@ the Development section below, and who ships a register the four above then draw
   stands alone, which is `EH` alone, and naming one for it would be a claim
   fejkdata has no business making.
 - **`misc.loglevel` is a table keyed by the code, not a list of names.** A syslog
-  message carries the severity as the number inside its PRI, so the code and the name
+  message carries the severity as the number its PRI encodes, so the code and the name
   are one fact and goal 1 draws them together. The `emerg`, `err` and `info` an
   rsyslog config takes are BSD's spellings, which RFC 5424 writes nowhere, so shipping
   them would be the hand-written mapping goal 10 keeps out of a sourced table.

data-import/loglevel.py

@@ -3,9 +3,7 @@
 
     data-import/loglevel.py [--source URL_OR_FILE] [--cache DIR] [--out FILE]
 
-Table 2 is the whole set, read between the facility table's caption and its own. The
+Table 2 is the whole set, read between the facility table's caption and its own.
-RFC describes both tables for informational purposes, so a severity is what an
-originator writes rather than something a collector rejects.
 """
 import argparse
 import re

table_test.go

@@ -733,7 +733,7 @@ func TestShippedTables(t *testing.T) {
 		"loglevel[5]":                           "Notice",
 		"loglevel[6]":                           "Informational",
 		"loglevel[7]":                           "Debug",
-		"loglevel[Informational].code":          "6",
+		"loglevel[Error].code":                  "3",
 	} {
 		if got := fake(t, f, path); got != want {
 			t.Errorf("Fake(%q) = %q, want %q", path, got, want)