(DOCSP-29528): Improve SBE release notes (#3068)

* (DOCSP-29528): Improve SBE release notes

* wording tweak

* wording

* change section title

Author: jeff-allen-mongo

snooty.toml

@@ -246,6 +246,9 @@ windows-sha256 = "C777DF7816BB8C9A760FDEA782113949408B6F39D72BE29A2551FA51E2FE04
 source-available = ":github:`source available and free to use <mongodb/mongo>`"
 pcre-abbr = ":abbr:`PCRE (Perl Compatible Regular Expressions)`"
 pcre = "Perl Compatible Regular Expressions"
+sbe = "slot-based query execution engine"
+sbe-short = "slot-based engine"
+sbe-title = "Slot-Based Query Execution Engine"
 # In Use Encryption Constants
 csfle = "Client-Side Field Level Encryption"
 csfle-abbrev = "CSFLE"

source/release-notes/7.0.txt

@@ -41,3 +41,8 @@ New Parameters
 MongoDB 7.0 adds the :parameter:`balancerMigrationsThrottlingMs`
 parameter which allows you to throttle the balancing rate.
 
+{+sbe-title+}
+~~~~~~~~~~~~~
+
+Starting in MongoDB 7.0, the :ref:`{+sbe+} <5.1-rel-notes-sbe>` improves
+performance for a wider range of find and aggregation queries.