Add words missing from slangs.rakudoc

From just before we enabled spelling on the PRs, probably

Author: coke

t/pws/code.pws

@@ -157,6 +157,7 @@ dccp
 ddd
 dddddeff
 debugtype
+declaratorone
 defg
 desigilname
 dest
@@ -332,6 +333,7 @@ megagigaterapetacorp
 megingjörð
 messageboxa
 messageboxw
+metamodelx
 mfoo
 mh
 mmn
@@ -526,6 +528,8 @@ unflat
 unitish
 unspec
 usafa
+valueclasshow
+valuemap
 versionmajor
 versionminor
 vn

t/pws/words.pws

@@ -437,6 +437,7 @@ execvp
 execvpe
 exitcode
 expmod
+exporthow
 expr
 extern
 eyewear
@@ -987,6 +988,7 @@ orcish
 ord
 ords
 orelse
+orm
 ors
 orson
 orwith
@@ -1604,6 +1606,7 @@ util
 utils
 utime
 vals
+valueclass
 valueidentifier
 valueobjat
 vardeclaration