docs: add info on OpenAlex to mentions sections

documentation/docs/01-users/05-adding-software.md

@@ -164,19 +164,19 @@ This section allows you to add mentions to your software page. You can use this
 
 ### Reference papers
 
-Use the *Search* box on the right hand side to find papers by DOI or title. All the relevant data about the publication will be retrieved automatically. A background scraper will use [OpenAlex](https://openalex.org/) to collect all citations of reference papers that have a DOI or an OpenAlex ID.
+Use the *Search* box on the right hand side to find papers by DOI, OpenAlex ID or title. All the relevant data about the publication will be retrieved automatically. A background scraper will use [OpenAlex](https://openalex.org/) to collect all citations of reference papers that have a DOI or an OpenAlex ID.
 
 ### Citations
 
-These are the citations of the reference papers that the RSD scraper was able to find on [OpenAlex](https://openalex.org/. It can take a few minutes before the citations are harvested.
+These are the citations of the reference papers that the RSD scraper was able to find on [OpenAlex](https://openalex.org/). It can take a few minutes before the citations are harvested.
 
 :::warning
 You cannot edit the content of this section. All entries are automatically harvested and generated by the RSD scraper. The mentions found are displayed in the mentions section of the software page.
 :::
 
 ### Related output
 
-Here you can add all additional related output. Use search to find papers or other publications by DOI or title. It is also possible to bulk add mentions, that have a DOI (use the *Import* button). On the popup, you can add one DOI per line, with a maximum of 50. After clicking on the *Next* button, we will fetch the data, which can take a moment. When that is done, you will see an overview of the data we fetched, including possible errors, where you can check the data and possibly disable some of the mentions.
+Here you can add all additional related output. Use search to find papers or other publications by DOI, OpenAlex ID or title. It is also possible to bulk add mentions, that have a DOI (use the *Import* button). On the popup, you can add one DOI per line, with a maximum of 50. After clicking on the *Next* button, we will fetch the data, which can take a moment. When that is done, you will see an overview of the data we fetched, including possible errors, where you can check the data and possibly disable some of the mentions.
 
 ## Testimonials
 

documentation/docs/01-users/07-adding-projects.md

@@ -95,7 +95,7 @@ Here you can add output that was produced by the project itself, such as papers,
 
 #### Add output
 
-To add an item, the search bar on the left can be used to search the RSD, [Crossref](https://crossref.org), and [DataCite](https://datacite.org) databases using the **Title** or **DOI** of the research output. An item can be added by selecting it from the list of the search results. The RSD will automatically classify the item based on the available metadata.
+To add an item, the search bar on the left can be used to search the RSD, [Crossref](https://www.crossref.org), [DataCite](https://datacite.org) and [OpenAlex](https://openalex.org/) databases using the **Title**, **DOI** or **OpenAlex ID** of the research output. An item can be added by selecting it from the list of the search results. The RSD will automatically classify the item based on the available metadata.
 
 #### Import output
 
@@ -124,7 +124,7 @@ Here you can add mentions of your project that cannot be found automatically by
 
 #### Search publication
 
-To add an item, the search bar on the left can be used to search the RSD, [Crossref](https://crossref.org), and [DataCite](https://datacite.org) databases using the **Title** or **DOI** of the research output. An item can be added by selecting it from the list of search results. The RSD will automatically classify the item based on the available metadata.
+To add an item, the search bar on the left can be used to search the RSD, [Crossref](https://www.crossref.org), [DataCite](https://datacite.org) and [OpenAlex](https://openalex.org/) databases using the **Title**, **DOI** or **OpenAlex ID** of the research impact item. An item can be added by selecting it from the list of search results. The RSD will automatically classify the item based on the available metadata.
 
 #### Import publication