chore: remove pdf-exporter from REST API schema examples (#236)

Author: grigoriev

app/src/main/java/ch/sbb/polarion/extension/generic/rest/model/Context.java

@@ -3,20 +3,21 @@
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.Getter;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 @Getter
 @Schema(description = "Represents the context for building URLs related to Polarion services")
 public class Context {
 
-    @Schema(description = "The extension context used as a base for URL construction", example = "pdf-exporter")
+    @Schema(description = "The extension context used as a base for URL construction")
     private final @NotNull String extensionContext;
 
-    @Schema(description = "Returns the base URL constructed with the extension context", example = "/polarion/pdf-exporter")
+    @Schema(description = "Returns the base URL constructed with the extension context")
     public @NotNull String getBaseUrl() {
         return "/polarion/" + extensionContext;
     }
 
-    @Schema(description = "Returns the REST API URL constructed with the extension context", example = "/polarion/pdf-exporter/rest")
+    @Schema(description = "Returns the REST API URL constructed with the extension context")
     public @NotNull String getRestUrl() {
         return "/polarion/" + extensionContext + "/rest";
     }
@@ -26,7 +27,7 @@ public class Context {
         return getRestUrl() + "/swagger";
     }
 
-    public Context(String extensionContext) {
+    public Context(@Nullable String extensionContext) {
         if (extensionContext == null || extensionContext.isBlank()) {
             throw new IllegalArgumentException("Extension context must be provided");
         }