Clarify current behaviour as per SERVER-30163 (Additional terms in phrase search are implicitly ignored)

Author: stennie

source/reference/operator/query/text.txt

@@ -107,9 +107,7 @@ phrase in escaped double quotes (``\"``), as in:
    "\"ssl certificate\""
 
 If the ``$search`` string includes a phrase and individual terms, text
-search will only match the documents that include the phrase. More
-specifically, the search performs a logical ``AND`` of the phrase with
-the individual terms in the search string.
+search will only match the documents that include the phrase.
 
 For example, passed a ``$search`` string:
 
@@ -118,8 +116,7 @@ For example, passed a ``$search`` string:
    "\"ssl certificate\" authority key"
 
 The :query:`$text` operator searches for the phrase ``"ssl
-certificate"`` **and** (``"authority"`` **or** ``"key"`` **or**
-``"ssl"`` **or** ``"certificate"`` ).
+certificate"``.
 
 .. _text-operator-term-negation: