small clarification for goToLine documentation (#15)

This distinction had me confused for a little bit today so I thought I
would document it. Happy to make any adjustments to the exact text.

---------

Co-authored-by: Andrew Dant <andrew.dant@clario.com>
Co-authored-by: Andreas Arvidsson <andreas.arvidsson87@gmail.com>

Author: 3 people

README.md

@@ -48,7 +48,7 @@ Many of the commands take arguments and return values that can only be used with
 - `andreas.focusTab(hint: string)`  
   Focus tab by hint. Hints range [A-ZZ].
 - `andreas.goToLine(line: number)`  
-  Go to line number.
+  Go to line number. 0-based index.
 - `andreas.selectTo(line: number)`  
   Select from current location to specified line.
 - `andreas.lineMiddle()`  

package.json

@@ -187,7 +187,7 @@
             {
                 "command": "andreas.goToLine",
                 "category": "Andreas",
-                "title": "Go to line number."
+                "title": "Go to line number. 0-based index."
             },
             {
                 "command": "andreas.selectTo",

src/commands/commands.ts

@@ -85,7 +85,12 @@ export const commandDescriptions = {
         "(index: number)"
     ),
     focusTab: visible("Navigation", "Focus tab by hint.", "Hints range [A-ZZ].", "(hint: string)"),
-    goToLine: visible("Navigation", "Go to line number.", undefined, "(line: number)"),
+    goToLine: visible(
+        "Navigation",
+        "Go to line number. 0-based index.",
+        undefined,
+        "(line: number)"
+    ),
     selectTo: visible(
         "Navigation",
         "Select from current location to specified line.",