chore(std.mem): Rename trimLeft and trimRight

Rename `trimLeft` to `trimStart`, and `trimRight` to `trimEnd`.
`trimLeft` and `trimRight` functions remain as deprecated aliases for
these new names.

lib/docs/wasm/markdown/Parser.zig

@@ -140,7 +140,7 @@ const Block = struct {
     /// (e.g. for a blockquote, this would be everything except the leading
     /// `>`). If unsuccessful, returns null.
     fn match(b: Block, line: []const u8) ?[]const u8 {
-        const unindented = mem.trimLeft(u8, line, " \t");
+        const unindented = mem.trimStart(u8, line, " \t");
         const indent = line.len - unindented.len;
         return switch (b.tag) {
             .list => line,
@@ -156,7 +156,7 @@ const Block = struct {
             .table_row => null,
             .heading => null,
             .code_block => code_block: {
-                const trimmed = mem.trimRight(u8, unindented, " \t");
+                const trimmed = mem.trimEnd(u8, unindented, " \t");
                 if (mem.indexOfNone(u8, trimmed, "`") != null or trimmed.len != b.data.code_block.fence_len) {
                     const effective_indent = @min(indent, b.data.code_block.indent);
                     break :code_block line[effective_indent..];
@@ -225,7 +225,7 @@ pub fn feedLine(p: *Parser, line: []const u8) Allocator.Error!void {
         p.pending_blocks.items.len > 0 and
         p.pending_blocks.getLast().tag == .paragraph)
     {
-        try p.addScratchStringLine(mem.trimLeft(u8, rest_line, " \t"));
+        try p.addScratchStringLine(mem.trimStart(u8, rest_line, " \t"));
         return;
     }
 
@@ -261,7 +261,7 @@ pub fn feedLine(p: *Parser, line: []const u8) Allocator.Error!void {
         last_pending_block.canAccept()
     else
         .blocks;
-    const rest_line_trimmed = mem.trimLeft(u8, rest_line, " \t");
+    const rest_line_trimmed = mem.trimStart(u8, rest_line, " \t");
     switch (can_accept) {
         .blocks => {
             // If we're inside a list item and the rest of the line is blank, it
@@ -500,7 +500,7 @@ fn appendBlockStart(p: *Parser, block_start: BlockStart) !void {
 }
 
 fn startBlock(p: *Parser, line: []const u8) !?BlockStart {
-    const unindented = mem.trimLeft(u8, line, " \t");
+    const unindented = mem.trimStart(u8, line, " \t");
     const indent = line.len - unindented.len;
     if (isThematicBreak(line)) {
         // Thematic breaks take precedence over list items.