bpo-35133: Fix mistakes when concatenate string literals on different lines. (GH-10284)

Two kind of mistakes:

1. Missed space. After concatenating there is no space between words.

2. Missed comma. Causes unintentional concatenating in a list of strings.
diff --git a/Tools/scripts/texi2html.py b/Tools/scripts/texi2html.py
index 9c1e9fe..5565c21 100755
--- a/Tools/scripts/texi2html.py
+++ b/Tools/scripts/texi2html.py
@@ -1806,7 +1806,7 @@
             print('<!-- This file defines the table of contents -->', file=fp)
             print('<HTML>', file=fp)
             print('<HEAD>', file=fp)
-            print('<meta name="GENERATOR"'
+            print('<meta name="GENERATOR" '
                         'content="Microsoft&reg; HTML Help Workshop 4.1">', file=fp)
             print('<!-- Sitemap 1.0 -->', file=fp)
             print('</HEAD>', file=fp)
@@ -1831,7 +1831,7 @@
             print('<!-- This file defines the index -->', file=fp)
             print('<HTML>', file=fp)
             print('<HEAD>', file=fp)
-            print('<meta name="GENERATOR"'
+            print('<meta name="GENERATOR" '
                         'content="Microsoft&reg; HTML Help Workshop 4.1">', file=fp)
             print('<!-- Sitemap 1.0 -->', file=fp)
             print('</HEAD>', file=fp)