document statement types (#1213)

Co-authored-by: Jens Pryce-Åklundh <[email protected]>

Author: nadja-muller

modules/ROOT/pages/clauses/index.adoc

@@ -175,7 +175,7 @@ Duplicates are retained.
 | Clause | Description
 
 m| xref::clauses/use.adoc[USE]
-| Determines which graph a query, or query part, is executed against. label:fabric[]
+| Determines which graph a query, or query part, is executed against.
 
 |===
 

modules/ROOT/pages/introduction/cypher-neo4j.adoc

@@ -137,13 +137,19 @@ Database transactions opened inside a DBMS-level transaction are committed or ro
 DBMS transactions have the following limitations:
 
 * Only one database can be written to in a DBMS transaction.
-* Cypher operations fall into the following main categories:
+* Queries executed in the same transaction must either be of the same statement type, or a combination of schema modifications and read queries. The following statement types exist:
+** Administration commands contain xref:clauses/index.adoc#administration-clauses[administration clauses], such as `CREATE DATABASE movies`
+** Schema modifications, which contain xref:clauses/index.adoc#index-and-constraint-clauses[index and constraint clauses],
+such as `CREATE CONSTRAINT ...`
+** Write queries, which contains xref:clauses/index.adoc#writing-clauses[writing clauses], such as `CREATE (n) RETURN n`
+** Read queries, which contain none of the above clauses, such as `MATCH (n) RETURN n`
 
-** Operations on graphs.
-** Schema commands.
-** Administration commands.
-
-It is not possible to combine any of these workloads in a single DBMS transaction.
+[NOTE]
+====
+Calling procedures on the system database does not count as an administration command.
+The query will be categorized either as a read or write query depending on the defined mode of the procedure.
+For more information, see the link:{neo4j-docs-base-uri}/operations-manual/current/procedures[Operations Manual -> Procedures.]
+====
 
 === ACID compliance