Suppress sentence spacing after end-of-sentence characters.

This should fix the inconsistent spacing issue mentioned in [1]. I also
fixed a spacing in issue in the man page.

[1]: https://lists.sr.ht/~sircmpwn/public-inbox/%3CC4VKFSIFINOA.X6VCIU2AV88M%40szk%3E

scdoc.5.scd

@@ -120,7 +120,7 @@ To begin a table, add an empty line followed by any number of rows.
 Each line of a table should start with | or : to start a new row or column
 respectively (or space to continue the previous cell on multiple lines),
 followed by [ or - or ] to align the contents to the left, center, or right,
-followed by a space and the contents of that cell.  You may use a space instead
+followed by a space and the contents of that cell. You may use a space instead
 of an alignment specifier to inherit the alignment of the same column in the
 previous row.
 

src/main.c

@@ -241,10 +241,17 @@ static void parse_text(struct parser *p) {
 		case '.':
 			if (!i) {
 				// Escape . if it's the first character
-				fprintf(p->output, "\\&.");
+				fprintf(p->output, "\\&.\\&");
 				break;
 			}
 			/* fallthrough */
+		case '!':
+		case '?':
+			last = ch;
+			utf8_fputch(p->output, ch);
+			// Suppress sentence spacing
+			fprintf(p->output, "\\&");
+			break;
 		default:
 			last = ch;
 			utf8_fputch(p->output, ch);

test/line-breaks

@@ -44,3 +44,12 @@ hello++
 _world_
 EOF
 end 0
+
+begin "Suppresses sentence spacing"
+scdoc <<EOF | grep 'hel!\\&lo.\\&' >/dev/null
+test(8)
+
+hel!lo.
+world.
+EOF
+end 0