Fix some logic when modifying scalars and simplify simple text deletion.

[postgresql/pg_jsonb_opx] / sql / README.md

diff --git a/sql/README.md b/sql/README.md
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-jsonb_opx
-=========
-
-Missing operators for jsonb in PostgreSQL 9.4, this may contain some errors and bad form as it's primarily just experimentation (i'm not a frequent C programmer; but everyone has to start somewhere right?).  Please test that it suits your requirements before using in any production scenario.
-
-Provides
---------
-
-The following behave like hstore 1.x operators, i.e. without nested jsonb traversal
-
-* deletion using **-** operator
-  * jsonb_delete(jsonb, text)
-  * jsonb_delete(jsonb, text[])
-  * jsonb_delete(jsonb, jsonb)
-* concatenation using **||** operator
-  * jsonb_concat(jsonb, jsonb)
-* replacement using **=#** operator
-  * jsonb_replace(jsonb, jsonb)
-
-The following are intended to eventually function like hstore 2.0 operators
-
-* deletion at chained path using **#-** operator
-    jsonb_delete_path(jsonb, text[])
-* replacement at chained path using function
-    jsonb_replace_path(jsonb, text[], jsonb)