Update features pages for new 'Version' header

Signed-off-by: Gerald Venzl <gerald.venzl@oracle.com>

Author: gvenzl

features/boolean.adoc

@@ -100,7 +100,6 @@ The `BOOLEAN` data type standardizes the storage of "Yes" and "No" values.
 
 == Further information
 
-* Introduced: xref:versions:{database-version}/index.adoc[]
 * Availability: All Offerings
 * link:https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/Data-Types.html[Documentation]
 * link:https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/Data-Types.html[Example]

features/feature.adoctemplate

@@ -26,7 +26,7 @@ Replace this text with the benefits the feature provides
 
 == Further information
 
-* Introduced: xref:versions:{database-version}/index.adoc[]
 * Availability: ###Oracle Database feature edition availability, use "All Offerings" if it is not factored###
-* link:###URL Link to the Doc###[Documentation]
-* link:###URL Link to an example###[Example]
+* link:###URL Link to the Doc[Documentation]###
+* link:###URL Link to an example[Example]###
+* link:###URL Link to any other content, videos, blogs posts, etc.[Video | Blog post | etc.]###

features/identity-columns.adoc

@@ -105,7 +105,6 @@ Identity columns ensure that the value for a new row will always be unique by us
 
 == Further information
 
-* Introduced: xref:versions:{database-version}/index.adoc[]
 * Availability: All Offerings
 * link:https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/CREATE-TABLE.html#GUID-F9CE0CC3-13AE-4744-A43C-EAC7A71AAAB6__CJAECCFH[Documentation - CREATE TABLE identity_clause]
 * link:https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/CREATE-TABLE.html#GUID-F9CE0CC3-13AE-4744-A43C-EAC7A71AAAB6__CJAHCAFF[Example]

features/if-not-exists.adoc

@@ -136,7 +136,6 @@ false positives by e.g. receiving an error when dropping an object that does not
 
 == Further information
 
-* Introduced: xref:versions:{database-version}/index.adoc[]
 * Availability: All Offerings
 * link:https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/DROP-TABLE.html#GUID-39D89EDC-155D-4A24-837E-D45DDA757B45[`DROP TABLE` documentation]
 

features/plsql-function-in-sql.adoc

@@ -96,7 +96,6 @@ but the user does either not have the necessary privileges to create a named fun
 
 == Further information
 
-* Introduced: xref:versions:{database-version}/index.adoc[]
 * Availability: All Offerings
 * link:https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/SELECT.html#GUID-CFA006CA-6FF1-4972-821E-6996142A51C6__BABFAFID[Documentation]
 * link:https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/SELECT.html#GUID-CFA006CA-6FF1-4972-821E-6996142A51C6__BABJFIDC[Example]

features/table-value-constructor.adoc

@@ -100,7 +100,6 @@ generate multiple rows with values.
 
 == Further information
 
-* Introduced: xref:versions:{database-version}/index.adoc[]
 * Availability: All Offerings
 * link:https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/SELECT.html#GUID-CFA006CA-6FF1-4972-821E-6996142A51C6[Multi-row `INSERT`] and link:https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/SELECT.html#GUID-CFA006CA-6FF1-4972-821E-6996142A51C6[`VALUES` row generation] documentation
 * link:https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/SELECT.html#GUID-CFA006CA-6FF1-4972-821E-6996142A51C6[Multi-row `INSERT`] and link:https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/SELECT.html#GUID-CFA006CA-6FF1-4972-821E-6996142A51C6[`VALUES` row generation] example