Add logic and operators tags to where.md for better discoverability

See rdwatters/hugo-docs-concept#37

content/functions/replacere.md

@@ -5,7 +5,7 @@ description: Replaces all occurrences of a regular expression with the replaceme
 godocref:
 date: 2017-02-01
 publishdate: 2017-02-01
-lastmod: 2017-02-01
+lastmod: 2017-04-30
 categories: [functions]
 tags: [regex]
 ns:

content/functions/where.md

@@ -7,7 +7,7 @@ date: 2017-02-01
 publishdate: 2017-02-01
 lastmod: 2017-04-30
 categories: [functions]
-tags: [filtering]
+tags: [filtering,logic,operators]
 ns:
 signature: ["where COLLECTION KEY [OPERATOR] MATCH"]
 workson: [lists,taxonomies,terms,groups]