[lex.pptoken] Mention import keywords in the category list.

jensmaurer · zygoloid · commit 089b47bf447d · 2019-10-05T21:57:38.000-07:00
diff --git a/source/lex.tex b/source/lex.tex
@@ -314,6 +314,7 @@
 \pnum
 A preprocessing token is the minimal lexical element of the language in translation
 phases 3 through 6. The categories of preprocessing token are: header names,
+\keyword{import} keywords,
 identifiers, preprocessing numbers, character literals (including user-defined character
 literals), string literals (including user-defined string literals), preprocessing
 operators and punctuators, and single non-white-space characters that do not lexically
