article 'a' for Angel names

The recently revised priestname(), which is also used for angels
since they share the " of <deity>" suffix, included a test for
'!strncmp(,"Angel ",6)', assuming it was looking at the beginning
of "Angel of <deity>".  But the " of <deity>" part doesn't get
appended until later, so the test should be '!strcmp(,"Angel")'
without the trailing space.

Noticed by code inspection; I don't have a test case.  Like priests,
Angels are almost always referred to as "_the_ Angel of <deity>" so
the bad "Angel " check normally wouldn't get reached.

Also, fix an unrelated indentation bit in fixes3-7-0.txt.

doc/fixes3-7-0.txt

@@ -119,7 +119,7 @@ tribute (Discworld snippets) typos, in book order rather than fix order:
 	 #12 "or" -> "of", #14 second instance of "megalomaniac" misspelled
 	Lords and Ladies passage #5, near end add missing opening double
 	 quote, passage #6 first footnote, insert omitted "be", passage #7
-	last paragraph, "to" -> "be"
+	 last paragraph, "to" -> "be"
 	Men at Arms passage #1, italicize /for/, passage #2, insert omitted
 	 word "had": 'it was /fate/ that _had_ let Edward'
 	Interesting Times passage #1, italicize several words

src/priest.c

@@ -314,7 +314,8 @@ priestname(
     if (!mon->ispriest && !mon->isminion) /* should never happen...  */
         return strcpy(pname, what);       /* caller must be confused */
 
-    /* this was done near the end but we want 'what' to be updated sooner */
+    /* for high priest(ess), "high" (or "grand" for poohbah) will be inserted
+       [this was done near the end but we want 'what' to be updated sooner] */
     if (mon->ispriest || aligned_priest || high_priest)
         what = do_hallu ? "poohbah" : mon->female ? "priestess" : "priest";
 
@@ -324,8 +325,9 @@ priestname(
             article = ARTICLE_THE;
         if (article == ARTICLE_THE) {
             Strcpy(pname, "the ");
-        } else if (!strncmpi(what, "Angel ", 6)) {
+        } else if (!strcmp(what, "Angel")) {
-            /* bypass just_an(); it would yield "the " due to capital A */
+            /* bypass just_an(); it would yield "" due to treating capital A
+               as indicating a personal name */
             Strcpy(pname, "an ");
         } else {
             (void) just_an(pname, what);