minor spelling edits

docs/User_Guide.md

@@ -8,7 +8,7 @@
 #### Technical Requirements 
 [neath](https://github.com/qurator-spk/neath) runs locally as a pure HTML+JavaScript webpage in your web browser. No software needs to be installed, but JavaScript has to be enabled in the browser. Any fairly recent browser should work, but only Chrome and Firefox are tested.
 #### Data input format   
-The input data format is based on the format used in the [GermEval2014 Named Entity Recognition Shared Task ](https://sites.google.com/site/germeval2014ner/data). Here, text is encoded as one token per line, with information provided in tab-separated columns. The first column contains either a #, which signals the source the sentence is cited from and the date it was retrieved, or the token number within the sentence. The second column contains the token. Name spans are encoded in the BIO-scheme. Outer spans are encoded in the third column, embedded spans in the fourth column.
+The input data format is based on the format used in the [GermEval2014 Named Entity Recognition Shared Task](https://sites.google.com/site/germeval2014ner/data). Here, text is encoded as one token per line, with information provided in tab-separated columns. The first column contains either a #, which signals the source the sentence is cited from and the date it was retrieved, or the token number within the sentence. The second column contains the token. Name spans are encoded in the BIO-scheme. Outer spans are encoded in the third column, embedded spans in the fourth column.
 
 Furthermore, we add a fifth column for an identifier from an authority file (in this case, the [GND](https://www.dnb.de/EN/Professionell/Standardisierung/GND/gnd_node.html) is used). Finally, columns six to nine are used for storing pixel coordinates for the facsimile snippets. 
 #### Data preparation  

neath.js

@@ -321,8 +321,8 @@ function setupInterface(data, file, urls) {
         let edit_html = `
             <div class="accordion" id="tokenizer" style="display:block;">
                 <section class="accordion-item tokenizer-action">&#8597;&nbsp;&nbsp;split</section>
-                <section class="accordion-item tokenizer-action">&#10227;&nbsp;merge-above</section>
+                <section class="accordion-item tokenizer-action">&#10227;&nbsp;merge</section>
-                <section class="accordion-item tokenizer-action">start-sentence</section>
+                <section class="accordion-item tokenizer-action">&#9735;&nbsp;sentence</section>
             </div>
         `;