Fix spelling mistakes in //docs.

docs/memory-infra/README.md

 # MemoryInfra
 
 MemoryInfra is a timeline-based profiling system integrated in chrome://tracing.
 It aims at creating Chrome-scale memory measurement tooling so that on any
 Chrome in the world --- desktop, mobile, Chrome OS or any other --- with the
 click of a button you can understand where memory is being used in your system.
 
 [TOC]
 
 ## Getting Started
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    the memory overhead of tracing. On Linux, this returns the resident set size.
  * **Peak Total Resident**: The overall peak working set size of the process on
    supported platforms. On Linux kernel versions >= 4.0 the peak usage between
    two memory dumps is shown.
  * **PSS**: POSIX only. The process's proportional share of total resident size.
  * **Private Dirty**: The total size of dirty pages which are not used by any
    other process.
  * **Swapped**: The total size of anonymous memory used by process, which is
    swapped out of RAM.
 
-**Columns in black** reflect a best estimation of the the amount of physical
+**Columns in black** reflect a best estimation of the amount of physical
 memory used by various subsystems of Chrome.
 
  * **Blink GC**: Memory used by [Oilpan][oilpan].
  * **CC**: Memory used by the compositor.
    See [cc/memory][cc-memory] for the full details.
  * **Discardable**: Total [discardable][discardable] memory used by the process
    from various components like Skia caches and Web caches.
  * **Font Caches**: Size of cache that stores Font shapes and platform Fonts.
  * **GPU** and **GPU Memory Buffer**: GPU memory and RAM used for GPU purposes.
    See [GPU Memory Tracing][gpu-memory].
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 Chrome-side design docs:
 
 <iframe width="100%" height="300px" src="https://docs.google.com/a/google.com/embeddedfolderview?id=0B3KuDeqD-lVJfndSa2dleUQtMnZDeWpPZk1JV0QtbVM5STkwWms4YThzQ0pGTmU1QU9kNVk">
 </iframe>
 
 Catapult-side design docs:
 
 <iframe width="100%" height="300px" src="https://docs.google.com/a/google.com/embeddedfolderview?id=0B3KuDeqD-lVJfm10bXd5YmRNWUpKOElOWS0xdU1tMmV1S3F4aHo0ZDJLTmtGRy1qVnQtVWM">
 </iframe>