doc: correct bitcoinconsensus_version in shared-libraries

Summary: Backport of Core [[bitcoin/bitcoin#15765 | PR15765]]

Test Plan: Verify that `BITCOINCONSENSUS_API_VER` is 1 in `bitcoinconsensus.h`

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D7761

doc/shared-libraries.md

@@ -7,11 +7,11 @@ The purpose of this library is to make the verification functionality that is cr
 
 ### API
 
-The interface is defined in the C header `bitcoinconsensus.h` located in  `src/script/bitcoinconsensus.h`.
+The interface is defined in the C header `bitcoinconsensus.h` located in `src/script/bitcoinconsensus.h`.
 
 #### Version
 
-`bitcoinconsensus_version` returns an `unsigned int` with the API version *(currently at an experimental `0`)*.
+`bitcoinconsensus_version` returns an `unsigned int` with the API version *(currently `1`)*.
 
 #### Script Validation