Enhance dictionary with HTML and CSS terms

While working on web integration for the assignment, fmtscan marked
'href' and 'rel' from HTML, and 'monospace' from CSS, as spelling
errors - a problem also seen in #265. Add these valid terms to the
dictionary to avoid false positives and ensure reliable static
analysis. This fixes the flagging issue from #265 but leaves its
request for better error details in fmtscan unaddressed.

Change-Id: Ia59908e7ce9bdf4b6c9e0110d5ad061d401cbba1

Author: HeatCrab

Diff for: scripts/aspell-pws

@@ -143,6 +143,7 @@ github
 glibc
 gprof
 hotfix
+href
 http
 https
 hv
@@ -201,6 +202,7 @@ mknod
 mlock
 mlockall
 mmap
+monospace
 mprotect
 mq
 mrs
@@ -287,6 +289,7 @@ regcomp
 regerror
 regexec
 regfree
+rel
 renderer
 retpoline
 reverseK