chore: changing api guidelines title

Author: daniCsorbaJB

docs/kr.tree

@@ -401,7 +401,7 @@
             <toc-element id="edu-tools-learner.md" toc-title="Learn Kotlin"/>
             <toc-element id="edu-tools-educator.md" toc-title="Teach Kotlin"/>
         </toc-element>
-        <toc-element toc-title="Library creators' guidelines">
+        <toc-element toc-title="Library authors' guidelines">
             <include from="kl" target="api-guidelines" origin="api-guidelines"/>
         </toc-element>
     </toc-element>

docs/topics/coding-conventions.md

@@ -1143,4 +1143,4 @@ When writing libraries, it's recommended to follow an additional set of rules to
  * Provide [KDoc](kotlin-doc.md) comments for all public members, except for overrides that do not require any new documentation
    (to support generating documentation for the library)
 
-Learn more about best practices and ideas to consider when writing an API for your library in [library creators' guidelines](api-guidelines-introduction.md).
+Learn more about best practices and ideas to consider when writing an API for your library in the [Library authors' guidelines](api-guidelines-introduction.md).